Yes, but then you'd want to see what the "future" holds for that time and then the next time period. I was born at a time when jet engines were just barely being used on passenger jets. Now, we are talking seriously of sending people to Mars and it might even happen in my lifetime. I can only imagine what I would see if I could live one more lifetime after this one. Of course, I do believe in an afterlife and I believe that I will get to watch what happens here. Time will just pass a lot faster for us then.
Yes, many of us will always long to see what is beyond our days. Although it is interesting to look back at what some prior generations would have seen. Imagine living 100 years, from 1900 to 2000. You would have gone from horse and carriage to automobiles to airplanes to jets to rockets launched into space. You would have gone from slide rules to mechanical calculators, to pocket calculators, to PC's, to laptops, to cell phones. I often wonder if I live 100 years, or close, if there will be as much extreme innovation as there was in that period. A truly fascinating lifespan to have lived. I wish I had known my great grandfather, but he died when I was only 2. He was born in 1898, and died in 1979. A friend of mine's grandmother's second husband was born in 1885 and was an inventor. He was interested in technology at a young age and actually personally witnessed the first deadly airplane crash in history. He has old tapes of the guy talking about his life experiences. He said he knew something was wrong and the guy was going to crash. I just think that is an amazing story.
Q&A: Hi Fraser. When a gravity wave pases through an object, does it influence objects and interactions at the microscale? Or: If we would've been close to a black hole merger and the large amplitude gravity wave would pass through the Earth (not sure about the attainable magnitudes), would there be any damage? Some tidal forces? Just to clarify, I don't mean the havoc it'd wreak on the orbits, just the impact on material objects. I know the gravity is not important at the microscale, but are there some works on it digestable to a non-astrophysicist? Jiří
I've been watching your videos for ages however I only recently discovered you done a video with my brother Scott Manley, I remember watching the interplanetary spaceship episode however that was prior to my weekly dedication to your channel. Awesome. Love your work
I see all of the better known channels that i follow. Three of my favorite obscure channels that deserve more publicity are: 1) John Michael Godier - He does multi-weekly videos on interesting space-sci topics. I catch his work as fanatically as Issac Arthur's! 2) Parallaxicality - Great content, I only just found him, but top notch! (think space-doc spliced with those Canadian classic "Hinterland Who's Who" nature shorts! Its his voice that bring that to mind. Nearly as soothing, but less monotone...sometimes. LoL ) 3) DeepSkyVideos & Sixty Symbols - sister sites. One focuses on messier objects, the other more general astronomical topics. Much less obscure than the 1st 2 tho... I remember hinterland from my infancy! Just as I remember the shuttle. i was born 2 weeks before the 1st flight...give these a serious look Fraser! cheers!
Option #1 makes me sleepy and I have to drink two cups of coffee to get through his videos. But in addition to Sixty Symbols I would recommend another sister channel, Periodic Videos. Another good one Harran does is Objectify where he digs around the Royal Society's collection for artifacts like Newton's original telescope.
Super big fan of: PBS Space Time, Smarter Everyday (Not a small following), Deep Sky Videos, Sixty Symbols. Love your channel, keep up the amazing work!
Why our solar system and assuming other star systems have the orbital bodies spining in a same orbit plane around the sun and not in a random directions? For example Pluto does not align together with other orbital bodies, it's tilted (over 17°). Why?
I have to say that I love your channel, it was one of the first that I subbed to. I have to ask, what originally inspired you to reach out and start your channel in the first place?
I've been a space journalist for almost 20 years now, and I started doing the Astronomy Cast podcast about 10 years ago. Doing video has always fascinated me, and I knew it was the future of science communication so I just kind of forced myself to start figuring it out. If you go back to the beginning, you can see us learning how to make these videos. :-)
Its great, but its been done, to farcical effect in futurama. LoL The ''space train'' used a prism as a switch to split the track & send carriages on different colours! It was awesome! But I agree with the concepts importance...cant wait!
Hello,Fraser What is the actual limit of the speed that we or any other particle that has mass can hit?For example the c speed is 10kph(the real number is too long to type) but we can't hit it cause we have mass right? Does it mean that we can accelerate to 9.9999999999999999 kph and so on up to infinite 9.(9) but still can't hit that c? Sounds like complicated topic
The limit is the speed of light, you can't hit it, but you can get to 99.9999999999...% of it. In fact, we can accelerate particles to that speed in places like CERN. If you could actually go that fast, the time dilation does some really crazy things. Check this out: th-cam.com/video/4tjQ8o8j-O8/w-d-xo.html
I got a question In a previous video you had said that universe is flat but as you had mentioned if you are in a room it is on earth (or even in a field) you need to have 4 90 degrees turn so my question is : we got to have 4 90 degrees turn to get back on the starting point (in the solar system) but what if this happens in a way larger scale ?we propably need 3 turns to get back in the starting point. Is it possible? And according to this is it possible that the universe is spherical?
How can we be so confident that the Universe is flat. Even if the Entire visible Universr is flat it could be an enomoly. If you envision time as a spacial dimension as in a black hole T could equal distance from creation. (Big Bang, Bounce, budding off fatherverse, etc.) More likely it would be a White hole or something similar. This model would explain a lot of observations (Dark energy, Dark matter, and maybe the relationship between super massive black holes and the surrounding Galexies.) Of corse other questions would be even more numerous. Is time really progressing or does our consciousness travel a path. Would time travel be possible of you traveled fast enough. Time travels slower as you approach light speed
Science Asylum is definately a channel that needs more subs. right now it's only at 17k. he goes fairly in depth into the math and other things, the humour and quality of the videos is pretty well done too.
indeed. That was actually how I found her channel. I was just spreading the word for those that might not have seen the episode. Socratica delivers their content in a very similar style to sarah. They also cover many other subjects, including computer science and videos on how to prep for tests and exams.
Cool... and you can use laser relays also as internet antennas for the solar wide web!... I suggest Pbs Spacetime, link4universe and Curiuss and Curious Droid. Ciao!
did you ever watch Cowboy Bebop? know the 'rings of time and space' that they use in their universe to colonize the solar system? there's any way to replicate this? or just the concept of space exploration by some kind of 'roads'? like, we just need to go to places at sublight speed only one time.
MarineIguana this is interesting; is there a handedness to the spin of galaxies? I would guess no, but what if there was some sort of preference for clockwise? And it would depend on our perspective, too.
Hey Fraser, as for other excellent channels - Dreksler is awesome and conducts all sorts of interesting thought experiments... I could only imagine what the two of you folks would come up with.
Thanks for the Nebula answer - I always wondered how "thick" they would be. I always assumed they would be near-invisible from inside, unlike as shown in Star Trek.
Hi Fraser, I am curious as to what the tolerances are for Earth's magnetosphere. In common illustrations you often see compression and resizing based on solar activity. Can a strong solar storm collapse the field outright? Will it recover quickly? will that put our atmosphere at risk in the short term?
Got question about traveling speed of light. As I understand it.. there's no way to Kno speed move thru space itself... Only speed relitive to other objects.. so two objects moving in opsite directions limited to ha!ve speed of light?
I'm willing to bet that our solar system being flung out of the galaxy would be devastating to us. I think that our solar system's relationship to nearby solar systems and the galaxy as a whole hasn't been fully realized by us yet.
How large would an orbiting laser transmitter need to be to propel _another_ laser transmitter to Tau Ceti in a reasonable timeframe? This is assuming that it could figure out and survive a series of orbital maneuvers that would slow it down and put it into a stable orbit. This is all so we could send probes at very high rates of speed to fly around Tau Ceti's planets and have them slowed down as they approached the system.
We talked about this a little bit in our episode about Fast Radio Bursts, about what it would take. The problem would be slowing it down once you got to Tau Ceti. I think we'll need to start with traditional trajectories to get the laser relays out to other stars before we can use the lasers themselves to accelerate and decelerate spacecraft between worlds.
Fraser Cain I just like to think that there's a way to slow down something from a very high velocity using gravity assist. Even if it takes 10 years and hundreds of dollars flybys, it would be worth it to have it there. I should write a book about the first time we do it... 😀
I just imagine that AI will eventually be good enough to work out how to use gravity assist and hundreds of orbits to slow down from 0.1c. Even if it takes a decade just to slow down, it'll be worth it to have it there. We could speed up later probes even faster as long as we had sufficient power to slow them down. I should write a short story about that...😀🤔
towards all directions so so every direction is redshifted equally i think in the pictures of the cmb the redshift thats caused by the earths motion through space is already calculated out i wanna know that number and direction maybe in reference to our galaxy :p
I have 2 questions to ask-1)Can a quasi star from nowadays in case there is a large amount of hydrogen somewhere in one region?-2)When an electroweak/quark star will somehow crush in our sun will it become an Torn-Zhitkov Object or they are just gonna explode
Generally you need some kind of event to collapse the hydrogen cloud in on itself, just a supernova shockwave. We did an episode on quark stars. The next step is black holes: th-cam.com/video/HLKco7pC4qI/w-d-xo.html
Fraser Cain Yeah I know cause I watched this video when it just got uploaded(Btw you're doing some great videos tbh,keep it up).But what if this neutron star somehow can dig a way to the sun core will it remain living there since it's theoretically possible ?
I liked the idea of using a laser to push sails ahead of a ship to act as a shield vs dust etc while travelling at dangerous speeds(Not as a source of propulsion, just as protection.)
15:30 would it hit the surface, I think within 0.1 AU of the sun there is a plasma corona that is millions of degrees, I don't think small objects would reach the surface of the Sun.
Fraser where can I make a question for your next qa video?I know I can do it here but it is too late and the question I want to ask is very complicated
Yeah, you just do it here. Complicated questions are dangerous, though, if it's long and complicated, it just takes too long to even read the question in the QA show.
Fraser Cain So here is it- How can you measure the power of explosion of the Hawking radiation?Is it possible that all the mass that it has swallowed through its life the matter just turns into energy through the singularity explosion itself and that might solve the information paradox of the black holes? or maybe black holes are not holes at all?some scientists say that those are formed of Maximon particle that are called q-stars for example v-404 Cygnus.
From what I understand, the Hawking process is slow and steady until the mass of the black hole is very small. And then the amount of energy released matches the amount of matter in the black hole via e=mc2.
Fraser Cain thank you for the answer!and I have another thing to ask you - what do you think about this whole theory of black holes I mean that we can see those black spheres but the singularity theory doesn't make sense at all cause nothing can reach the infinity in the universe and that can show us the maximon theory -the element with the plank mass and these objects are called Black Holes type 2 or the q-stars
I'm not a cosmologist, so I'm just synthesizing what the latest research is. Just because something doesn't make sense doesn't mean that it's not correct. Our physics break down within a black hole's event horizon, but that just means that we don't have good enough physics... yet.
I am kinda confused. So there is no real gravity or objects attracting each other, only warped and twisted space-time? I hardly can imagine how "empty" space is bend and therefore effecting light or planets.
Here's a question: We get a couple tons worth of meteors falling into the atmosphere per day, and we obviously get a bunch of energy from the sun. But on the other hand the Earth is also radiating heat and losing some of its atmosphere. So is the net mass/energy of the Earth increasing or decreasing?
Hello Mr Cain. love the vids, especially the question and answer ones. I know you are a big fan of these too. I myself make a few youtube vids for a game I play, more recently with dialogue. It takes me ages and many takes to put together just a 2 or 3 min vid, and I am only recording my voice! So as I sit here and watch another 17 min vid from you (with the mandatory quick out-take at the end) I am wondering:... just how long does it take you to make these videos? you and your wife must either be extremely proficient or have endless patience.
Thanks a lot! I typically do the QA episodes off the top of my head and in one take. I occasionally give an answer I don't like and redo it, but mostly you're just seeing my stream of consciousness. For the regular episodes, they're prewritten scripts and I'm reading from a teleprompter. I make a few mistakes on those but we go back and redo a few paragraphs for easier editing.
When something reaches the event horizon of a black hole, it is only capable of moving closer to a black hole and can never reverse. Doesn't this create a logical error preventing black holes from merging? When the horizons first touch doesn't that mean spacetime flows one way in two mutually opposite directions?
One other one… If you entangled 2 particles, and then you put one on a spaceship that then accelerated away at relativistic speeds, if you then change one particle, would the other change at the exact same time even though it's clock is moving at a significantly different time rate? Would the particle on the ship also still be able to be effected even if the careless ship captain accidentally fell below the event horizon of a blackhole?
Is it possible that like on krypton we are bound to our planet and cannot ever leave for any great length of time, due to radiation and general health decline, and the only way to do this will be to alter a select few of us to be more suitable for long term space travel.
I agree that there are major ethical concerns with generational ships. And not just the fuzzy philosophical stuff, but I feel like, given human nature, that is doomed to fail. Imagine being born in the second generation. What percentage of that generation would grow up and realize "This is kind of f%&^ed up!" and refuse to carry on the traditional / mission. Every generation you'd have a percentage who would lose their minds. Eventually the generations would get smaller and smaller and the whole micro-society would collapse. Either because of a shrinking genetic pool, sociological instability, or just a dying population. I think that our species will master living in our own solar system, send robots to other stars (possibly seed them with life), and, when all the planets are harvested for materials, and there is little left to do in our star system, we will settle into our Matrioshka Brain and live out the rest of the universe in a virtual dreamstate.
Yeah, I should have addressed the idea of just sending robots with life seeding capabilities on board. Frozen lifeforms that could jumpstart future ecosystems.
Given the straightforward geometry of the Earth-Moon-Sun system, it seems that solar eclipses should occur at specific intervals, and yet the frequency of solar eclipses seems to be completely random. Why is that?
Well, I knew that the Moon's orbit is at an angle, which is why we don't get an eclipse every month (in fact, I asked this same question in freshman science many many moons ago, and my teacher didn't know... this was before you could simply look things up online). But my question is about the periodicity of eclipses, or the seeming lack thereof. Is there ANY periodicity at all to solar eclipses?
are single stage to orbit vehicles possible with today's technology? The reason why I ask is because I believe that single stage technology would open up space to the human race as never before. Having a spacecraft that can go into orbit and then land with minimal maintenance and rapid turnaround time, would make space flight very cheap. I believe it could be done with today's technology, but I would like your opinion.
Fraser Cain - Ahhh I missed this one somehow. Right now in Kerbal Space Program, i'm using a mod called realism overhaul that supposedly turns the game into something that is supposed to match reality. Engines, fuels, materials all that jazz. And with this I've been working on a single staged vehicle. And like in your video that you just linked to me, it is quite a challenge. So keep doing what you're doing and stay awesome.
I think there have been a few vehicles built that could theoretically get to orbit in one stage if they were carrying no payload. So, not that useful. In order to make a useful SSTO we need to either have engines with greater ISP but still high thrust or improve mass fraction with lighter structural materials. Problem is we're pretty close to the limits of current technologies in both areas today. Maybe with nuclear thermal rockets or nanotech materials we could.
With the laser acceierator stations do you need a rocket to get you into orbit and then receive the laser boost or do you think that there will be alternatives?
I think you'll still need a rocket, although there are some alternatives to rockets. Check out this video we did: th-cam.com/video/Mg1hF6lmEl0/w-d-xo.html
I'm sorry but for everything that you say gives me so many more questions. I'm not trying to be super knowledgeable or anything but I find so many more things to ask. I am grateful that you take the time to answer even if sometimes you may think that my questions are dumb.
AI and Automation are both going to radically change the world. Part of the reason I started my homestead was to learn the skills (and then teach them to my daughter) to be as self-sufficient as possible and to be ready as possible for the radical change. Even if this change is ultimately a good thing (e.g. post-scarcity Star Trek awesomeness) there will be a chaotic and painful transition period.
I think self-sufficiency is worth investigating, but I also think part of the magic of human society is that we can specialize, take advantage of trade, automation, etc. I just spent 4 days hiking in the Canadian wilderness, and spending an hour a day to collect and purify our own water got really old. :-)
Great point! And, I do agree. I dream of a world where we each work to improve society by playing the part we can given the skills, knowledge, and passions that we have. If every single one of us, every single day, had to do everything, we wouldn't get much of anywhere. My comment was meant specifically in the context of sudden, extreme change where the exchange of our specialized skills / products might be disrupted. :)
Hi Fraser, I was wondering what would the other plants look like if they swapped places with Earth? Especially The ice giants, would they have land masses like Earth?
I'm not a cosmologist, but from what I understand, the annihilation of matter/antimatter doesn't produce the kind of expansive force that's expanding the Universe. It would make an explosion "in" space, not an expansion "of" space.
I would like a show on moon base manufacturing facilities and a Mars mission launched from there!! Mining and manufacturing launching space craft from the moon
(I'm new to the channel, so apologies if you've answered this before). If you were able to observe and control dark energy, could you use it to make a spaceship that completes distances that are light years away from each other, without physically moving faster than the speed of light, but completing that distance within a window of time that would have required a proton to be traveling thousands of times the speed of light to reach the destination at the same time as you? If so, would this avoid the issue of breaking causality that ftl-travel hypotheses have to deal with?
We do not know what dark energy is. If you mean negative matter, there are already models like the alcubierre drive which allow FTL if you have negative mass.
Your idea of the laser grid. Are you expecting them to be free floating or on planets, moons, generic big rocks? For the Jupiter and beyond area where solar is so meek what kind of power were you thinking?
Hey Fraser, here is a hypothetical scenario. Matter transmition ala Star Trek's transporters could be used to travel at the speed of light. We could send out automated relay stations to receive and boost the signals effectively "beaming" people and resources over interstellar distances. Of course this would take hundreds or thousands of years to initially set up, but once it is operational travel would be at light speed. What are your thoughts on this?
Very interesting and informative video. I seem to have been preempted on channels so I will pose a question. Given the science knowledge we take for granted today was over about the past couple of hundred years was science fiction, is it not at least theoretically possible that what is considered impossible today, ie faster than light speed travel (which seems popular) be possible within the next couple of hundred years be a possibility?
Of course it's possible, but we don't know which things will be possible. We always have to speculate based on the laws of physics as we currently understand them, and modify our future based on new discoveries.
Fraser Cain with are current technology I agree. But if solar sails or something works out it could change to a couple hundred. And if we can make the ship a nice enough place I think people would want to go
The biggest problem is having children in space. Have you ever tried to child proof your house? Imagine a daycare on a 747 flying for 8 hours from New York to London and having nobody with any living experience as to what might happen if you open a door midflight. Imagine child proofing a structure where if anybody opens the wrong door you all die.
Question: If you had international support and unlimited funding how would your order your space program Fraser? Lunar base first? Multiple orbitals at various moons? Near-earth asteroid mining? Artificial Gravity in LEO? Obviously you can have simultaneous robotic missions as well as human. The sky is obviously not the limit ;) I know your previous series with Issac had lots of ideas but I'm curious.
suppose we created a wormhole, visit alpha centauri and return thorugh the wormhole again, would we see ourselves in the alpha centauri if we look at it after 4.3 years? (assuming we have very huge telescope too)
So you talked about space travel and how do we need to develop a ship that can withstand the damages sustained from Interstellar space dust. Could we accomplish this with an electromagnetic field around the spacecraft using electromagnets?
Do we have any idea why particles with no mass (i.e. Photons) are compelled to move at the speed of light/causality? If so, what insight does that give us about the nature of our universe?
Laser transit system sounds cool, when we build the lunar base we should use that for the supply line, to research and perfect the method before getting started on using laser for system and interstellar propulsion :)
It will be a little confusing to make this question but here it goes: There is this good exercise to visualize gravity: th-cam.com/video/MTY1Kje0yLg/w-d-xo.htmlm6s And having that in mind, dark matter has an inverse effect in gravity then does matter. So... is there any theory or does make sense to think that maybe dark matter could be just regular matter, but "knocking by the other side" if our universe have a irregular shape?
I was expecting the whole time (in two occasions actually) that you would also bring up the "Seeding Ships" that would bring fertilized eggs (or genetic assembly instructions) to other planets to make the first generation "hatch" in artificial wombs like in "Songs Of Distant Earth". ^_^
First thanks for the recommendation to visit the canyon. We had a nice half day in Vancouver hitting the canyon and Stanley Park. With NASA announcing the plan to redirect Didymos B with the DART project. How close should an asteroid be coming towards earth before we should be concerned? I hear of asteroids coming "close" but the distance always seem pretty far away. For example "2010 NY65. Calculations predict it will come within 1.9 million miles of us this time around, a cat’s whisker in astronomical terms"
I'm glad you enjoyed Vancouver. :-) Once the new asteroid surveys have been completed, we'll have a much more comprehensive understanding of what's out there. I'll bet we'll find many many more objects of "concern". 1.9 million miles is nothing. Way beyond the orbit of the Moon.
I shall repeat my question, as I never got the answer: Will we ever get ourselves a visible trash ring at, say, geostationary orbit? (Maybe a thin one like Jupiter's). Space junk we are sending into orbit is pretty reflective, you know? So, if we keep on doind what whe do now in the same growing rate, how soon will we have a noticeable ring around the planet?
If we get to the point that we've got a visible ring, then we've got a problem. Scientists already track tens of thousands of pieces of space junk on various orbits. It's not all on a perfectly equatorial location.
If the majority of mass in a galaxy is dark matter than are black holes primarily made out of the stuff? Wonder if it has implications in the formation of stars or other phenomena's we haven't figured out yet.
I feel like any civilization seriously considering generation ships will already also have access to radical life extension technology. The latter will render the former obsolete.
Lol, Isaac Arthur, Vintage Space, Scott Manley... Subscribed to all of them. Maybe you guys should one day form a TH-cam space community alliance or something.
6:30 this answer is incorrect. 80% of the stars we see in the sky are actually distant galaxies. So while the stars in our galaxy would slowly disappear, most of the 'stars' would still be there. However, we'd also eventually see the Milky Way itself, probably as a disk stretching across the sky.
Since breaking the speed of light is impossible, is it possible for us to travel at the speed of light? Not close to it, but the speed of light itself. Maybe something similar to a warp drive?
Although very abstract, what are your thoughts on how to survive the ultimate fate of the universe for example, heat death. Of course it seems astronomically unlikely if not impossible but I'm just looking for thoughts. :)
Hey #FraserCain I love your videos. Question : You talk a lot about the way to travel in our solar system, laser "railway", but what about the communication and how to sync those laser railway ?
Fraser, some other youtubers use Patreon money to travel to museums and relevant places and make a video of their trip. Would you ever do that? Maybe you could get into NASA and see their work in person
I seen that yes. Good video. I was thinking of the Kennedy Space Museum Visitor Centre Complex for the tourists? You never went there and you could get a couple of videos out of it as its relatively big. I'm sure your kids will appreciate going to Universal Studios and Disneyland after xD
Instead of FTL drives why not a drive that effect your placement in time? In other words you travel say 10% light speed and travel for an hour but also have a time displacement of 59 minutes and 59.5 seconds into the past. Wouldn't that have the effect of traveling that distance in 1/2 a second?
i hope the nazis from the dark side of the moon kidnap you for forcing me to read a notification :,( oh and they have the same channel in russian with the same name but with even more videos
if the observable Universe of 'normal' matter is only 4% of the constituent parts of reality (excluding Dark Matter, Dark Energy - and Dark Flow), how can we have any kind of confidence that our understanding of physics is correct? Is it not more likely that the theories we have developed so far are not (albeit effective for our limited domain) work-arounds based on our restricted understanding of the data we can collect/perceive? And wouldn't this explain (and invalidate) the fact that our current theories need to have arbitrary initial conditions in order to make logical sense? I guess what I'm saying is: Can we face up to the fact that our science is a workable 'fudge' trying to explain a universe (or for that matter - a reality) we are not even fully cognitive of, much less comprehend? What made me ask this is a comment mentioned in this video about black holes and does dark matter have any part to play in their explanation. If dark matter/energy/flow is 96% of reality, surely it, more than anything theorist have so far even conceived (e.g 19th/20th physics) is entirely what is at work here? Is our current science yet another (advancement) of the deity solution because it is based on limited, insufficient evidence? (and thereby as inherently stupid from the point of view of a more advanced 'US' further down the line?) We (as a scientific method-driven) society just seem so sure of our 'Gods', whereas our own data would seem to indicate we are barely scratching the surface? On another, lighter note - Frazer, I LOVE your channel!
How do scientists know Proxima Centauri is the closest star?Have they looked at all the stars in every direction in space, or is there possibly others closerthat they haven't found?
Hey Fraser, maybe you should do a piece explaining why, for those that go on the trip, there is no perception of a speed limit. To the people on the ship, the ship continues to accelerate due to Lorentz contraction and time dialation. I think many folks don't get it. If you have a good fusion powered ship you can go almost anywhere without FTL. Once we are effectively immortal we can go anywhere in the galaxy and return home a million years later to our friends and family.😜
Lifespan is the factor that maybe most yielding given the revolution in genetic modification. A person that can live for 10 000 years can take a 100 or even a 1000 years for a trip into the blackness.
In this video you said that there is the possibility that 'dark matter' is made up of a zillion tiny black holes. Just to punch a hole in that theory (all pun intended) isn't it true that the smaller a black hole is the shorter a life span they have? Would they have been able to last the 13 billion years that the universe has been around?
Yeah, so the smallest ones would have already evaporated, but the more massive ones would still be around. Anything more massive than about 10 million metric tonnes would still be around.
It really sucks that we will be all dead before such great discovers be made in our galaxy
Yup, I always wish I could live in the future to see what happens next.
Fraser Cain Me too!
Yes, but then you'd want to see what the "future" holds for that time and then the next time period. I was born at a time when jet engines were just barely being used on passenger jets. Now, we are talking seriously of sending people to Mars and it might even happen in my lifetime. I can only imagine what I would see if I could live one more lifetime after this one. Of course, I do believe in an afterlife and I believe that I will get to watch what happens here. Time will just pass a lot faster for us then.
Yes, many of us will always long to see what is beyond our days. Although it is interesting to look back at what some prior generations would have seen. Imagine living 100 years, from 1900 to 2000. You would have gone from horse and carriage to automobiles to airplanes to jets to rockets launched into space. You would have gone from slide rules to mechanical calculators, to pocket calculators, to PC's, to laptops, to cell phones. I often wonder if I live 100 years, or close, if there will be as much extreme innovation as there was in that period. A truly fascinating lifespan to have lived. I wish I had known my great grandfather, but he died when I was only 2. He was born in 1898, and died in 1979. A friend of mine's grandmother's second husband was born in 1885 and was an inventor. He was interested in technology at a young age and actually personally witnessed the first deadly airplane crash in history. He has old tapes of the guy talking about his life experiences. He said he knew something was wrong and the guy was going to crash. I just think that is an amazing story.
Personally, I am giving it 50/50 odds that we will still be alive. Live forever or die trying!
theres some really thought provoking scifi shorts stories or animations that are truly worth looking at. just a cruise through them is worth it to all
Q&A: Hi Fraser.
When a gravity wave pases through an object, does it influence objects and interactions at the microscale? Or: If we would've been close to a black hole merger and the large amplitude gravity wave would pass through the Earth (not sure about the attainable magnitudes), would there be any damage? Some tidal forces? Just to clarify, I don't mean the havoc it'd wreak on the orbits, just the impact on material objects.
I know the gravity is not important at the microscale, but are there some works on it digestable to a non-astrophysicist?
Jiří
I may occasionally disagree with you and I learn megabytes from you but in my years of listening to you, you are never, ever, boring! Thank you!
Thanks Larry!
deep sky videos and really everything brady makes
Great suggestions. :-)
I've been watching your videos for ages however I only recently discovered you done a video with my brother Scott Manley, I remember watching the interplanetary spaceship episode however that was prior to my weekly dedication to your channel. Awesome. Love your work
Whatever you do, do not pause the video at 1:43... I had a phone call, returned and Fraser spooked me... :) Love you man.
I've paused it at 1:43 and I'm seeing a still shot of Fraser talking. What am I looking for?
I see all of the better known channels that i follow. Three of my favorite obscure channels that deserve more publicity are:
1) John Michael Godier - He does multi-weekly videos on interesting space-sci topics. I catch his work as fanatically as Issac Arthur's!
2) Parallaxicality - Great content, I only just found him, but top notch! (think space-doc spliced with those Canadian classic "Hinterland Who's Who" nature shorts! Its his voice that bring that to mind. Nearly as soothing, but less monotone...sometimes. LoL )
3) DeepSkyVideos & Sixty Symbols - sister sites. One focuses on messier objects, the other more general astronomical topics. Much less obscure than the 1st 2 tho...
I remember hinterland from my infancy! Just as I remember the shuttle. i was born 2 weeks before the 1st flight...give these a serious look Fraser!
cheers!
Thanks for the suggestion of John Michael Godier, I'm really enjoying his channel.
Option #1 makes me sleepy and I have to drink two cups of coffee to get through his videos. But in addition to Sixty Symbols I would recommend another sister channel, Periodic Videos. Another good one Harran does is Objectify where he digs around the Royal Society's collection for artifacts like Newton's original telescope.
Super big fan of: PBS Space Time, Smarter Everyday (Not a small following), Deep Sky Videos, Sixty Symbols. Love your channel, keep up the amazing work!
Great suggestions, thanks!
Why our solar system and assuming other star systems have the orbital bodies spining in a same orbit plane around the sun and not in a random directions? For example Pluto does not align together with other orbital bodies, it's tilted (over 17°). Why?
this video is so high quality it looks like real life
Since ftl with the albecurrie drive is so controversial, is it still possible to use it for very efficient slower-than-light travel?
Have you seen Person of Interest? Highly recommend it!
I have. They did a great job dealing with the threat of a AI.
I have to say that I love your channel, it was one of the first that I subbed to. I have to ask, what originally inspired you to reach out and start your channel in the first place?
I've been a space journalist for almost 20 years now, and I started doing the Astronomy Cast podcast about 10 years ago. Doing video has always fascinated me, and I knew it was the future of science communication so I just kind of forced myself to start figuring it out. If you go back to the beginning, you can see us learning how to make these videos. :-)
That railroad analogy for acceleration laser routes is perfect. I'm stealing that. ;O)-
Awesome, let me know what you do with it. :-)
The Goat I want it too xD
Its great, but its been done, to farcical effect in futurama. LoL
The ''space train'' used a prism as a switch to split the track & send carriages on different colours! It was awesome!
But I agree with the concepts importance...cant wait!
Hello,Fraser What is the actual limit of the speed that we or any other particle that has mass can hit?For example the c speed is 10kph(the real number is too long to type) but we can't hit it cause we have mass right? Does it mean that we can accelerate to 9.9999999999999999 kph and so on up to infinite 9.(9) but still can't hit that c? Sounds like complicated topic
The limit is the speed of light, you can't hit it, but you can get to 99.9999999999...% of it. In fact, we can accelerate particles to that speed in places like CERN. If you could actually go that fast, the time dilation does some really crazy things. Check this out: th-cam.com/video/4tjQ8o8j-O8/w-d-xo.html
I got a question In a previous video you had said that universe is flat but as you had mentioned if you are in a room it is on earth (or even in a field) you need to have 4 90 degrees turn so my question is : we got to have 4 90 degrees turn to get back on the starting point (in the solar system) but what if this happens in a way larger scale ?we propably need 3 turns to get back in the starting point. Is it possible? And according to this is it possible that the universe is spherical?
You'd still need 4 turns, even if you went billions of light-years away.
How can we be so confident that the Universe is flat. Even if the Entire visible Universr is flat it could be an enomoly. If you envision time as a spacial dimension as in a black hole T could equal distance from creation. (Big Bang, Bounce, budding off fatherverse, etc.) More likely it would be a White hole or something similar. This model would explain a lot of observations (Dark energy, Dark matter, and maybe the relationship between super massive black holes and the surrounding Galexies.) Of corse other questions would be even more numerous. Is time really progressing or does our consciousness travel a path. Would time travel be possible of you traveled fast enough. Time travels slower as you approach light speed
Science Asylum is definately a channel that needs more subs. right now it's only at 17k. he goes fairly in depth into the math and other things, the humour and quality of the videos is pretty well done too.
correction:
The Science Asylum is the name of the channel. i for the "the" part. : ]
Space with Sarah and Socratica are great channels with modest followings, both do a great job breaking down complex ideas for the everyday person.
Did you see that I did a collaboration with Sarah? I'll probably be doing another soon: th-cam.com/video/knw10ooUCK4/w-d-xo.html
indeed. That was actually how I found her channel. I was just spreading the word for those that might not have seen the episode. Socratica delivers their content in a very similar style to sarah. They also cover many other subjects, including computer science and videos on how to prep for tests and exams.
Cool... and you can use laser relays also as internet antennas for the solar wide web!...
I suggest Pbs Spacetime, link4universe and Curiuss and Curious Droid. Ciao!
Yup, they can provide transportation and communications.
did you ever watch Cowboy Bebop? know the 'rings of time and space' that they use in their universe to colonize the solar system?
there's any way to replicate this? or just the concept of space exploration by some kind of 'roads'? like, we just need to go to places at sublight speed only one time.
Do all galaxies spin the same way?
Nope, they're totally random.
MarineIguana this is interesting; is there a handedness to the spin of galaxies? I would guess no, but what if there was some sort of preference for clockwise? And it would depend on our perspective, too.
Clockwise and Anticlockwise don't really exist in space. It's all about perspective. Which side of the galaxy are you looking at?
Of the perspective of the North and South pole, of course! And by extension, the ecliptic.
Do all Stars rotate a galexy in the same direction.
Hey Fraser, as for other excellent channels - Dreksler is awesome and conducts all sorts of interesting thought experiments... I could only imagine what the two of you folks would come up with.
Thanks for the Nebula answer - I always wondered how "thick" they would be. I always assumed they would be near-invisible from inside, unlike as shown in Star Trek.
Yup, the Orion Nebula would never look any better than it does right now. th-cam.com/video/_9NMXy1FKPA/w-d-xo.html
Fraser Cain Hah! I missed that video of yours. That is perfect! Love the "meat camera" bit.
Im actually designing a habitat for a lunar mining colony for my thesis in B.arch design. The expanse is inevitable! And its coming
That's fantastic, let me know when you're done, maybe we can do an episode on lunar colonies.
Hi Fraser, I am curious as to what the tolerances are for Earth's magnetosphere. In common illustrations you often see compression and resizing based on solar activity. Can a strong solar storm collapse the field outright? Will it recover quickly? will that put our atmosphere at risk in the short term?
It can't collapse it completely, just deform it and change it. The next episode is all about the Van Allen Belts, so stay tuned.
Sciencephile the A.I. is my current fave science channel
Got question about traveling speed of light. As I understand it.. there's no way to Kno speed move thru space itself... Only speed relitive to other objects.. so two objects moving in opsite directions limited to ha!ve speed of light?
I'm willing to bet that our solar system being flung out of the galaxy would be devastating to us. I think that our solar system's relationship to nearby solar systems and the galaxy as a whole hasn't been fully realized by us yet.
What do you think would happen?
Why in your opinion aren't significantly more assets poured into Fusion power research?
Mate I had no idea about that "galactic magnetosphere" that's insane! Can you tell us more about it? How is it formed? What does it protect us from??
How large would an orbiting laser transmitter need to be to propel _another_ laser transmitter to Tau Ceti in a reasonable timeframe? This is assuming that it could figure out and survive a series of orbital maneuvers that would slow it down and put it into a stable orbit. This is all so we could send probes at very high rates of speed to fly around Tau Ceti's planets and have them slowed down as they approached the system.
We talked about this a little bit in our episode about Fast Radio Bursts, about what it would take. The problem would be slowing it down once you got to Tau Ceti. I think we'll need to start with traditional trajectories to get the laser relays out to other stars before we can use the lasers themselves to accelerate and decelerate spacecraft between worlds.
Fraser Cain I just like to think that there's a way to slow down something from a very high velocity using gravity assist. Even if it takes 10 years and hundreds of dollars flybys, it would be worth it to have it there. I should write a book about the first time we do it... 😀
I just imagine that AI will eventually be good enough to work out how to use gravity assist and hundreds of orbits to slow down from 0.1c. Even if it takes a decade just to slow down, it'll be worth it to have it there. We could speed up later probes even faster as long as we had sufficient power to slow them down. I should write a short story about that...😀🤔
SciShow Space is kinda obvious, but regarding futurism i only know you & Arthur.
how fast and in which direction do you have to go to be static towards the cmb (so no (or the same) redshift in any direction)
Which part of the CMB? It's in all directions.
towards all directions so so every direction is redshifted equally
i think in the pictures of the cmb the redshift thats caused by the earths motion through space is already calculated out
i wanna know that number and direction maybe in reference to our galaxy :p
I have 2 questions to ask-1)Can a quasi star from nowadays in case there is a large amount of hydrogen somewhere in one region?-2)When an electroweak/quark star will somehow crush in our sun will it become an Torn-Zhitkov Object or they are just gonna explode
Generally you need some kind of event to collapse the hydrogen cloud in on itself, just a supernova shockwave. We did an episode on quark stars. The next step is black holes: th-cam.com/video/HLKco7pC4qI/w-d-xo.html
Fraser Cain Yeah I know cause I watched this video when it just got uploaded(Btw you're doing some great videos tbh,keep it up).But what if this neutron star somehow can dig a way to the sun core will it remain living there since it's theoretically possible ?
I liked the idea of using a laser to push sails ahead of a ship to act as a shield vs dust etc while travelling at dangerous speeds(Not as a source of propulsion, just as protection.)
15:30 would it hit the surface, I think within 0.1 AU of the sun there is a plasma corona that is millions of degrees, I don't think small objects would reach the surface of the Sun.
The gas particle would hit the surface, but no, you're right, it would boil by the time it hit that boiling temperature.
Fraser where can I make a question for your next qa video?I know I can do it here but it is too late and the question I want to ask is very complicated
Yeah, you just do it here. Complicated questions are dangerous, though, if it's long and complicated, it just takes too long to even read the question in the QA show.
Fraser Cain So here is it-
How can you measure the power of explosion of the Hawking radiation?Is it possible that all the mass that it has swallowed through its life the matter just turns into energy through the singularity explosion itself and that might solve the information paradox of the black holes? or maybe black holes are not holes at all?some scientists say that those are formed of Maximon particle that are called q-stars for example v-404 Cygnus.
From what I understand, the Hawking process is slow and steady until the mass of the black hole is very small. And then the amount of energy released matches the amount of matter in the black hole via e=mc2.
Fraser Cain thank you for the answer!and I have another thing to ask you - what do you think about this whole theory of black holes I mean that we can see those black spheres but the singularity theory doesn't make sense at all cause nothing can reach the infinity in the universe and that can show us the maximon theory -the element with the plank mass and these objects are called Black Holes type 2 or the q-stars
I'm not a cosmologist, so I'm just synthesizing what the latest research is. Just because something doesn't make sense doesn't mean that it's not correct. Our physics break down within a black hole's event horizon, but that just means that we don't have good enough physics... yet.
I am kinda confused.
So there is no real gravity or objects attracting each other, only warped and twisted space-time?
I hardly can imagine how "empty" space is bend and therefore effecting light or planets.
Here's a question: We get a couple tons worth of meteors falling into the atmosphere per day, and we obviously get a bunch of energy from the sun. But on the other hand the Earth is also radiating heat and losing some of its atmosphere. So is the net mass/energy of the Earth increasing or decreasing?
It's actually pretty close. Check out this article from Brian Koberlein: briankoberlein.com/2015/12/15/is-earth-gaining-mass-or-losing-mass/
Cool. Thanks for the reply and keep up the good work!
Hello Mr Cain. love the vids, especially the question and answer ones. I know you are a big fan of these too.
I myself make a few youtube vids for a game I play, more recently with dialogue. It takes me ages and many takes to put together just a 2 or 3 min vid, and I am only recording my voice! So as I sit here and watch another 17 min vid from you (with the mandatory quick out-take at the end) I am wondering:... just how long does it take you to make these videos? you and your wife must either be extremely proficient or have endless patience.
Thanks a lot! I typically do the QA episodes off the top of my head and in one take. I occasionally give an answer I don't like and redo it, but mostly you're just seeing my stream of consciousness. For the regular episodes, they're prewritten scripts and I'm reading from a teleprompter. I make a few mistakes on those but we go back and redo a few paragraphs for easier editing.
So a total pro then :D keep up the great work!
When something reaches the event horizon of a black hole, it is only capable of moving closer to a black hole and can never reverse. Doesn't this create a logical error preventing black holes from merging? When the horizons first touch doesn't that mean spacetime flows one way in two mutually opposite directions?
One other one… If you entangled 2 particles, and then you put one on a spaceship that then accelerated away at relativistic speeds, if you then change one particle, would the other change at the exact same time even though it's clock is moving at a significantly different time rate? Would the particle on the ship also still be able to be effected even if the careless ship captain accidentally fell below the event horizon of a blackhole?
Is it possible that like on krypton we are bound to our planet and cannot ever leave for any great length of time, due to radiation and general health decline, and the only way to do this will be to alter a select few of us to be more suitable for long term space travel.
Maybe, we talked a bit about this idea of marsiforming ourselves. th-cam.com/video/E5AeXm4I0l8/w-d-xo.html
How long would it take us to accelerate to light speed without passing out?
Hey Fraser, how do you think the development of nanotechnology and genetic manipulation effect space exploration?
At which point of the up and down oscillation are we right now?
Right now we're within the disk, so protected from the intergalactic radiation.
But how long until we leave the disk?
I agree that there are major ethical concerns with generational ships. And not just the fuzzy philosophical stuff, but I feel like, given human nature, that is doomed to fail. Imagine being born in the second generation. What percentage of that generation would grow up and realize "This is kind of f%&^ed up!" and refuse to carry on the traditional / mission. Every generation you'd have a percentage who would lose their minds. Eventually the generations would get smaller and smaller and the whole micro-society would collapse. Either because of a shrinking genetic pool, sociological instability, or just a dying population. I think that our species will master living in our own solar system, send robots to other stars (possibly seed them with life), and, when all the planets are harvested for materials, and there is little left to do in our star system, we will settle into our Matrioshka Brain and live out the rest of the universe in a virtual dreamstate.
Yeah, I should have addressed the idea of just sending robots with life seeding capabilities on board. Frozen lifeforms that could jumpstart future ecosystems.
Given the straightforward geometry of the Earth-Moon-Sun system, it seems that solar eclipses should occur at specific intervals, and yet the frequency of solar eclipses seems to be completely random. Why is that?
Here's a video we did that explains this exactly: th-cam.com/video/ljwZMYy930s/w-d-xo.html
Well, I knew that the Moon's orbit is at an angle, which is why we don't get an eclipse every month (in fact, I asked this same question in freshman science many many moons ago, and my teacher didn't know... this was before you could simply look things up online). But my question is about the periodicity of eclipses, or the seeming lack thereof. Is there ANY periodicity at all to solar eclipses?
are single stage to orbit vehicles possible with today's technology? The reason why I ask is because I believe that single stage technology would open up space to the human race as never before. Having a spacecraft that can go into orbit and then land with minimal maintenance and rapid turnaround time, would make space flight very cheap. I believe it could be done with today's technology, but I would like your opinion.
Have you seen this episode? th-cam.com/video/xykHuImBQ0o/w-d-xo.html
Fraser Cain - Ahhh I missed this one somehow. Right now in Kerbal Space Program, i'm using a mod called realism overhaul that supposedly turns the game into something that is supposed to match reality. Engines, fuels, materials all that jazz. And with this I've been working on a single staged vehicle. And like in your video that you just linked to me, it is quite a challenge. So keep doing what you're doing and stay awesome.
I think there have been a few vehicles built that could theoretically get to orbit in one stage if they were carrying no payload. So, not that useful. In order to make a useful SSTO we need to either have engines with greater ISP but still high thrust or improve mass fraction with lighter structural materials. Problem is we're pretty close to the limits of current technologies in both areas today. Maybe with nuclear thermal rockets or nanotech materials we could.
Are there any stars or even solar systems that have been discovered that float between the galaxies - basically that are not a part of a galaxy?
With the laser acceierator stations do you need a rocket to get you into orbit and then receive the laser boost or do you think that there will be alternatives?
I think you'll still need a rocket, although there are some alternatives to rockets. Check out this video we did: th-cam.com/video/Mg1hF6lmEl0/w-d-xo.html
I'm sorry but for everything that you say gives me so many more questions. I'm not trying to be super knowledgeable or anything but I find so many more things to ask. I am grateful that you take the time to answer even if sometimes you may think that my questions are dumb.
AI and Automation are both going to radically change the world. Part of the reason I started my homestead was to learn the skills (and then teach them to my daughter) to be as self-sufficient as possible and to be ready as possible for the radical change. Even if this change is ultimately a good thing (e.g. post-scarcity Star Trek awesomeness) there will be a chaotic and painful transition period.
I think self-sufficiency is worth investigating, but I also think part of the magic of human society is that we can specialize, take advantage of trade, automation, etc. I just spent 4 days hiking in the Canadian wilderness, and spending an hour a day to collect and purify our own water got really old. :-)
Great point! And, I do agree. I dream of a world where we each work to improve society by playing the part we can given the skills, knowledge, and passions that we have. If every single one of us, every single day, had to do everything, we wouldn't get much of anywhere. My comment was meant specifically in the context of sudden, extreme change where the exchange of our specialized skills / products might be disrupted. :)
Hi Fraser, I was wondering what would the other plants look like if they swapped places with Earth? Especially The ice giants, would they have land masses like Earth?
No, they're made of gas and ices, so they wouldn't have a solid landmass.
Could the annihilation of anti matter and matter be the cause of inflation?
I'm not a cosmologist, but from what I understand, the annihilation of matter/antimatter doesn't produce the kind of expansive force that's expanding the Universe. It would make an explosion "in" space, not an expansion "of" space.
Fraser Cain thanks for the info
I would like a show on moon base manufacturing facilities and a Mars mission launched from there!! Mining and manufacturing launching space craft from the moon
I really want to do an episode all about what it would take to get a base on the Moon. I'll count this as another vote.
There are many moons around Uranus and Neptune that need to be explored, and do you think tidal heating could make some of the moons habitable?
(I'm new to the channel, so apologies if you've answered this before). If you were able to observe and control dark energy, could you use it to make a spaceship that completes distances that are light years away from each other, without physically moving faster than the speed of light, but completing that distance within a window of time that would have required a proton to be traveling thousands of times the speed of light to reach the destination at the same time as you? If so, would this avoid the issue of breaking causality that ftl-travel hypotheses have to deal with?
We do not know what dark energy is. If you mean negative matter, there are already models like the alcubierre drive which allow FTL if you have negative mass.
What's your opinion on the 9th planet myth: Nemesis?
It's a hoax.
Your idea of the laser grid. Are you expecting them to be free floating or on planets, moons, generic big rocks? For the Jupiter and beyond area where solar is so meek what kind of power were you thinking?
Hey Fraser, here is a hypothetical scenario. Matter transmition ala Star Trek's transporters could be used to travel at the speed of light. We could send out automated relay stations to receive and boost the signals effectively "beaming" people and resources over interstellar distances. Of course this would take hundreds or thousands of years to initially set up, but once it is operational travel would be at light speed. What are your thoughts on this?
Very interesting and informative video. I seem to have been preempted on channels so I will pose a question. Given the science knowledge we take for granted today was over about the past couple of hundred years was science fiction, is it not at least theoretically possible that what is considered impossible today, ie faster than light speed travel (which seems popular) be possible within the next couple of hundred years be a possibility?
Of course it's possible, but we don't know which things will be possible. We always have to speculate based on the laws of physics as we currently understand them, and modify our future based on new discoveries.
Fraser Cain Thank you for your reply and I do see the logic. It is always theoretical until new discoveries indicate otherwise.
If we could make rotating space habitats that people we living there lives on why couldn't we put an engine on some and go to other solar systems
It's just the distances and timeframes involved. Our best technology would still take tens of thousands of years to get to another star system.
Fraser Cain with are current technology I agree. But if solar sails or something works out it could change to a couple hundred. And if we can make the ship a nice enough place I think people would want to go
Also just thought I'd thank you for doing this show I've learned a lot from you
The biggest problem is having children in space. Have you ever tried to child proof your house? Imagine a daycare on a 747 flying for 8 hours from New York to London and having nobody with any living experience as to what might happen if you open a door midflight. Imagine child proofing a structure where if anybody opens the wrong door you all die.
Question: If you had international support and unlimited funding how would your order your space program Fraser? Lunar base first? Multiple orbitals at various moons? Near-earth asteroid mining? Artificial Gravity in LEO? Obviously you can have simultaneous robotic missions as well as human. The sky is obviously not the limit ;) I know your previous series with Issac had lots of ideas but I'm curious.
PBS Space time.
SciShow/SciShow space.
Issac Arthur.
Seeker.
Sixty Symbols.
Thunderf00t (sometimes lol).
Ad event horizon/john mihael godier to that list
suppose we created a wormhole, visit alpha centauri and return thorugh the wormhole again, would we see ourselves in the alpha centauri if we look at it after 4.3 years? (assuming we have very huge telescope too)
You would see Earth as it was 4.3 years ago, then you'd return back home and see it as it is now.
Could you do a video on chandrashekhar limit
Sure, we actually talked a bit about it in this video: th-cam.com/video/RZKiWGT4Za4/w-d-xo.html
Whatever happened to the EM Drive?
So you talked about space travel and how do we need to develop a ship that can withstand the damages sustained from Interstellar space dust. Could we accomplish this with an electromagnetic field around the spacecraft using electromagnets?
We talk about this idea here: th-cam.com/video/pjFTke8E1jA/w-d-xo.html
Do we have any idea why particles with no mass (i.e. Photons) are compelled to move at the speed of light/causality? If so, what insight does that give us about the nature of our universe?
Laser transit system sounds cool, when we build the lunar base we should use that for the supply line, to research and perfect the method before getting started on using laser for system and interstellar propulsion :)
Could you destroy a black hole with negative matter, not antimatter.
It all depends on what negative matter actually is, and how it behaves with regular matter, but it's certainly possible.
Cool, but can a supermasive black hole rip apart a smaller black hole if it woosht by.
Nope, they either merge or zip past each other.
It will be a little confusing to make this question but here it goes:
There is this good exercise to visualize gravity: th-cam.com/video/MTY1Kje0yLg/w-d-xo.htmlm6s
And having that in mind, dark matter has an inverse effect in gravity then does matter. So... is there any theory or does make sense to think that maybe dark matter could be just regular matter, but "knocking by the other side" if our universe have a irregular shape?
I'm not sure I understand, dark matter doesn't have an inverse effect on gravity. It pulls with regular gravity.
Sry, I was mistaken! I meant dark energy. Please consider everything I said changing dark matter for dark energy :D
Do you think advanced artificial intelligence could be a key element to the Fermi Paradox?
I don't think so. Then you just ask, where are all the alien robots?
I was expecting the whole time (in two occasions actually) that you would also bring up the "Seeding Ships" that would bring fertilized eggs (or genetic assembly instructions) to other planets to make the first generation "hatch" in artificial wombs like in "Songs Of Distant Earth". ^_^
First thanks for the recommendation to visit the canyon. We had a nice half day in Vancouver hitting the canyon and Stanley Park.
With NASA announcing the plan to redirect Didymos B with the DART project. How close should an asteroid be coming towards earth before we should be concerned? I hear of asteroids coming "close" but the distance always seem pretty far away. For example "2010 NY65. Calculations predict it will come within 1.9 million miles of us this time around, a cat’s whisker in astronomical terms"
I'm glad you enjoyed Vancouver. :-) Once the new asteroid surveys have been completed, we'll have a much more comprehensive understanding of what's out there. I'll bet we'll find many many more objects of "concern". 1.9 million miles is nothing. Way beyond the orbit of the Moon.
What is your opinion of Erik Verlinde's emergent gravity theory?
I shall repeat my question, as I never got the answer: Will we ever get ourselves a visible trash ring at, say, geostationary orbit? (Maybe a thin one like Jupiter's). Space junk we are sending into orbit is pretty reflective, you know? So, if we keep on doind what whe do now in the same growing rate, how soon will we have a noticeable ring around the planet?
If we get to the point that we've got a visible ring, then we've got a problem. Scientists already track tens of thousands of pieces of space junk on various orbits. It's not all on a perfectly equatorial location.
If the majority of mass in a galaxy is dark matter than are black holes primarily made out of the stuff?
Wonder if it has implications in the formation of stars or other phenomena's we haven't figured out yet.
I feel like any civilization seriously considering generation ships will already also have access to radical life extension technology. The latter will render the former obsolete.
Well, it will work on the same principle, but it won't be a generational ship. Just a ship.
Lol, Isaac Arthur, Vintage Space, Scott Manley... Subscribed to all of them. Maybe you guys should one day form a TH-cam space community alliance or something.
a great youtube channel is TMRO all space related.
6:30 this answer is incorrect. 80% of the stars we see in the sky are actually distant galaxies. So while the stars in our galaxy would slowly disappear, most of the 'stars' would still be there. However, we'd also eventually see the Milky Way itself, probably as a disk stretching across the sky.
I can only see a couple of galaxies in the sky with my eyes. Andromeda, M33, and the LMC and SMC. Sure, with a telescope, you can see more.
@@frasercain Oh, then I think I may be wrong. I defer to your knowledge, I'd read somewhere the opposite was true.
Is it possible an antimatter universe could exist in the opposite direction of time from us, backwards from the big bang?
Since breaking the speed of light is impossible, is it possible for us to travel at the speed of light? Not close to it, but the speed of light itself. Maybe something similar to a warp drive?
Although very abstract, what are your thoughts on how to survive the ultimate fate of the universe for example, heat death. Of course it seems astronomically unlikely if not impossible but I'm just looking for thoughts. :)
But what if we put the people in cryobeds in the generation ships. That way we have to use less energy
Hey #FraserCain I love your videos. Question : You talk a lot about the way to travel in our solar system, laser "railway", but what about the communication and how to sync those laser railway ?
The laser relay could work for communications too. It would do double duty. :-)
If we could go faster then light, how much faster then light would be possible? Or would that be infinite?
The dangerous thing about AI is not AI itself, but the ignorance of the regular person on the dangers of AI.
Well said.
Fraser, some other youtubers use Patreon money to travel to museums and relevant places and make a video of their trip. Would you ever do that? Maybe you could get into NASA and see their work in person
Did you ever see our trip to NASA last September to watch Osiris-Rex take off? th-cam.com/video/XpQ_MbwNdQA/w-d-xo.html
I seen that yes. Good video. I was thinking of the Kennedy Space Museum Visitor Centre Complex for the tourists? You never went there and you could get a couple of videos out of it as its relatively big. I'm sure your kids will appreciate going to Universal Studios and Disneyland after xD
Instead of FTL drives why not a drive that effect your placement in time? In other words you travel say 10% light speed and travel for an hour but also have a time displacement of 59 minutes and 59.5 seconds into the past. Wouldn't that have the effect of traveling that distance in 1/2 a second?
Ridddle is a good channel about these types of things too
Great suggestion on Ridddle, thanks!
i hope the nazis from the dark side of the moon kidnap you for forcing me to read a notification :,( oh and they have the same channel in russian with the same name but with even more videos
The most plausible ftl drive and what's keeping us from having it
What is nasa's planetary protection ?
if the observable Universe of 'normal' matter is only 4% of the constituent parts of reality (excluding Dark Matter, Dark Energy - and Dark Flow), how can we have any kind of confidence that our understanding of physics is correct? Is it not more likely that the theories we have developed so far are not (albeit effective for our limited domain) work-arounds based on our restricted understanding of the data we can collect/perceive? And wouldn't this explain (and invalidate) the fact that our current theories need to have arbitrary initial conditions in order to make logical sense?
I guess what I'm saying is: Can we face up to the fact that our science is a workable 'fudge' trying to explain a universe (or for that matter - a reality) we are not even fully cognitive of, much less comprehend?
What made me ask this is a comment mentioned in this video about black holes and does dark matter have any part to play in their explanation. If dark matter/energy/flow is 96% of reality, surely it, more than anything theorist have so far even conceived (e.g 19th/20th physics) is entirely what is at work here? Is our current science yet another (advancement) of the deity solution because it is based on limited, insufficient evidence? (and thereby as inherently stupid from the point of view of a more advanced 'US' further down the line?)
We (as a scientific method-driven) society just seem so sure of our 'Gods', whereas our own data would seem to indicate we are barely scratching the surface?
On another, lighter note - Frazer, I LOVE your channel!
How do scientists know Proxima Centauri is the closest star?Have they looked at all the stars in every direction in space, or is there possibly others closerthat they haven't found?
Is it feasible that we we made by someone's/ somethings intelligent design?
Hey Fraser, maybe you should do a piece explaining why, for those that go on the trip, there is no perception of a speed limit. To the people on the ship, the ship continues to accelerate due to Lorentz contraction and time dialation. I think many folks don't get it. If you have a good fusion powered ship you can go almost anywhere without FTL. Once we are effectively immortal we can go anywhere in the galaxy and return home a million years later to our friends and family.😜
if that's true I'd love to hear Fraser explain it ;)
Lifespan is the factor that maybe most yielding given the revolution in genetic modification. A person that can live for 10 000 years can take a 100 or even a 1000 years for a trip into the blackness.
Harambe's Ghost I completely agree!
In this video you said that there is the possibility that 'dark matter' is made up of a zillion tiny black holes. Just to punch a hole in that theory (all pun intended) isn't it true that the smaller a black hole is the shorter a life span they have? Would they have been able to last the 13 billion years that the universe has been around?
Yeah, so the smallest ones would have already evaporated, but the more massive ones would still be around. Anything more massive than about 10 million metric tonnes would still be around.