Fun fact: The ends of the LIGO arms are built up slightly higher than the surrounding landscape, because they had to be so straight, that they had to account for the curvature of the Earth.
It went from 900+ likes on the dad joke, 250 likes on a weird yo momma reference, and 20 ATM for a select few that had a bit of a nerd cringe moment, but also still laughes and voted for the inability to put the book down 1st because it's still funny laughing at stupid obvious yet *farts loudly*.... see what I mean?
Fabric of spacetime, gravitational waves at LIGO, time being a material thing that "flows" at variable rates, black holes, dark matter, dark energy, Jesus H Christ it boggles the mind that people actually believe theoretical physics is a form of physics and cant see a mystical cult if it talked to them in a patronizing voice pretending the brain just can't grasp obvious contradiction because someone called it "counter-intuitive: *facepalm*
A white hole created each galaxy with matter from another universe as well as causing cosmic inflation. Today, our galaxy is slowly disappearing back down that black rabbit hole! :)> ... did you mean vini vedi vici? ... I came I saw, & she got everything?
I think that overall the quality of scripts for Simon's physics episodes have gone up. So he either hired better writers (more physics knowledgeable) or more thorough research is going into these. Some earlier episodes had some very obvious errors.
When I was watching the "Lost In Space" movie with my family, there was a scene in which the planet the ship was orbiting spontaneously (through technological means) collapsed into a black hole. This caused the *Jupiter 2* to begin falling into the newly formed, planet-massed black hole--ostensibly because of the increased gravity, because, well, it's now a black hole--instead of maintaining its original orbit. Out loud, I said, "Oh, COME ON!" Everyone in the theater looked at me as if I had farted during a ballet. Sometimes being a physicist makes life difficult...
Astro, any time you have more knowledge about a topic than others around you, you are weird. Example, watching the movie drop zone, I could tell where all the other skydivers were by their laughter during scenes that were supposed to be serious but skydivers knew to be impossible. The vast majority of people want to be the same, not correct.
So I know saying that the 4th dimension is time is not _exactly_ correct but is used as a way to explain it in layman's terms because it's very difficult to understand for the smartest of us, mainly because we are 3 dimension beings.. But could a better explanation be _Space/Time_ is the 4th dimension and _gravity_ is our _interaction_ with the 4th dimension? I'll stop there because any more and i will type out a book with ease! I have spent almost the last hour on only watching the 1st 5 minutes of this video, pausing, rewinding, pausing; my mind lost on this tangent revelation and trying to understand it, grasp it as best as I can with how extremely limited that is possible! We are just not physically able to observe this next higher dimension. And just as we cannot fully grasp what gravity is, this is because it is not a force as stated. It's not an actual "thing" as difficult to grasp as that is since we feel it every instance.. but calling the fundamental "forces" "interactions" instead, it makes it easier to visualize that gravity is only 2 or more (everything really) bodies interacting with each other in the 4th dimension, and we are experiencing the results of that/those interaction(s). Any thoughts or ideas you would like to share would be amazing! Am I on the right track? Or am I just really high and need to get my life together because I'm talking craziness? 😂😂 my mind _is_ feel very fried right now, mostly from spending the last hour trying to understand the 4th dimension and how it explains gravity!! Only mostly tho 😅😊😁🫠 I feel I have barely said 2 words on this exploration of reality but already have the paragraphs I didn't want to start, it would be nothing to do 20 more and still only barely scratched the surface; so I will stop here!! Hope you are able to follow my thought process and I hope this helps others slightly grasp the idea(if I am right!?! 😂)
@@ronprince1478 what?? What are you talking about?? No, just because you enjoy falling thru life blindly ignorant of the world around you, doesn't mean "the vast majority," or even _ANYONE_ else feels the same! And having knowledge and even _sharing_ knowledge is not weird.. there is just so much wrong with what you had said, _that_ is what is weird!!
@@jacobviator3118 I believe you when you say you are stoned, that comment was in support of the narrator stating what other people don’t understand is SEEN as being weird. I may fall through life (as a skydiver, pilot, GA, LSA, Glider, paraglider and hang glider pilot), but I don’t need mind altering drugs to cope with the real world.
Cool, I didn't know this. Could this be used to determine ancient celestial objects that have long since disappeared from our view and figure out where they came from and went too?
@@johnhoppkins7258 No, because the pulls are soo small that you couldn't really measure them. They also somewhat equalize out over distances, so that the overall pull in any given direction that might happen to have greater mass, is even smaller. It's pretty much assured that some point in some direction has greater overall mass in that direction than any other direction, but it's impossible to determine. And even if you could somehow determine that, you still couldn't determine anything else about it, because it could be any configuration of any number of objects that make up that difference in pull. It's like having a ball pit where you're trying to determine what balls are exerting what pressure on others, without being able to touch or see the other balls, and without knowing how big or deep the ball pit is.
Since the location of the Gravity force cannot be found in the studies of classical knowledge and the effect of atoms at all, I assume, as the stupidest person in the world, that Gravity can be found in its basic quality through the quantum world. i.e. all of the gravity is probably in that area.
0:35 - Chapter 1 - It's not exactly a force 5:05 - Chapter 2 - Our theories fall apart at the quantum level 7:45 - Chapter 3 - It's also limited by the speed of light 12:20 - Chapter 4 - Gravity warps the passage of time 15:45 - Chapter 5 - It is most extreme in black holes
Another thing with Gravity, GPS has to take account of time dilation for both Special and General Relativity otherwise the accuracy would drift away rather quickly by about 2km per day.
@@sophierobinson2738 No, the 15 degree per hour "drift" is just due to the rotation of the earth. One full rotation of 360 degrees / 24 hours = 15 degrees per hour. It wouldn't be exactly 15 degrees due tot he difference between a sidereal day and a solar day. Newtonian mechanics is fine for just about everything. You could fly to the moon just with newtonian mechanics. The gps system needs relativistic corrections because it uses time to determine location. The satellites broadcast the time using atomic clocks on the satellites and at ground stations. The receiver calculates the location based on the difference in time from different satellites. The satellites are moving fast in orbit, which causes their time to slow down slightly compared to on earth (special relativity), but they are also up much higher which causes their time to be slightly faster than on earth (general relativity).
The Deep Space Network, when using Doppler shifts to determine velocity for orbital determination, must apply a frequency offset that differs for each site, Australia versus California. The offset is derived from the gravity felt at each site. Density of the ground and elevation change the values of the apparent gravity at each site.
Yes, competing effects. Because the satellites are traveling in orbit faster than the ground receiver, special relativity says their clocks should be slower. But they are farther away from the gravity 'well' of earth, so their clocks should be faster. I forget off hand which one is larger, but it's also interesting that the eccentricity of their orbit (causing distance of satellite and its speed to vary) are also compensated.
@@jamescox8429 If A moves fast relative to B, then B moves fast relative to A. Is it A's or B's time that slows down? Basic question which is usually skipped by those who try to explain this.
I think those 5 things are much more understood, thank to the hundreds of video describing them, than the everyday personal experience of being permanently pulled to the ground although we don't move, which is almost never explained in terms of spacetime curvature.
Hey writers! Super awkward timing (I know the time between script and release is delayed) but the “radiation” or light only black hole was just proven impossible in a paper released I think exactly a week ago, maybe 2 weeks ago. I’m not 100% certain if it was peer-reviewed yet but.. just so you know haha. Honestly with how much crazy space stuff has been figured out this year it can probably be a “10 discoveries this year (plus some corrections) video
The spectra of the speed of light has been solved for hundreds of years; the experiment to prove it merely requires a Prism creating a Rainbow. Additionally, that concept of escaping the event horizon only accounts for static propulsion systems; a variable propulsion system could easily escape the inside of the event horizon via Orbital Slingshot Maneuver.
Ahhh... >raises finger< Your path may lead toward the singularity (there is evidence that the singularity can be orbited or bypassed) but it does NOT end with you MEETING the singularity. Space trades places with time and so the singularity remains forever IN YOUR FUTURE.
New theory: Is it possible, that spacetime is so curved in the black hole and especially near singularity (twisted into a huge knot), that path becomes "almost" infinite - so it's impossible to reach that dead end point and therefore singularity doesn't exist? For example expansion of the Universe (the fabric of spacetime) becomes bigger and bigger, so the "knot" can keep twisting and twisting? How about that? 3 beers and a new theory has born, and we solved the singularity problem :D
BTW, by symmetry (and Gauss' Law), the Earth's gravity is zero at the center. It's estimated to continuously increase to a maximum of 10.7 m/sec**2 (due to denser inner core) and then settles down to about 9.8 m/sec**2 as it moves to the surface.
Cool. Can actually someone far away, a distant observer see an object or a person crossing the event horizon? Or, the light from the crossing object would not ever leave so it becomes completely black? And does singularity really exist?
@@sophierobinson2738 i swear Simo and team do these things on purpose and clearly obvious mispronunciation of commonly known words. I grit my teeth and laugh every time🤣
Herf is a universal constant that is both an immovable object and an unstoppable force, moving at a speed 1mm/sec faster than the stated speed of light. This is why gravity doesn't work herf, herf works gravity.
The "elastic sheet" visualization of the gravity field doesn't really show that the larger body (in a 2-body system) also moves about the barycenter. So we have to revert to the magical force at a distance.
I was a few days behind in viewing my favorite TH-cam content. I made my tea, grabbed a couple lemon cookies I'd made earlier in the day, turned on the TV and up popped "GRAVITY DOESN'T WORK HERF". I was trying my best to figure out what HERF meant (thinking it an unfamiliar acronym). Heavy Earthen Radial Fixtures? Then it hit me, I almost spilled my tea laughing at myself. As always, wonderful, well researched and well-presented content that is much appreciated.
Some of the most interesting and beautiful mathematics I have read in the last two decades was surrounding SuperString/ String theory. If beauty was a measurement of veracity then 100% we have strings.
Could it be that smaller objects are more drawn to larger objects than larger objects but they appear to be equally drawn to each other. Like dust is drawn to objects in a room, (which may be by static electricity) - or is there a static attraction to gravity?
About time dilation with proximity to large masses, a simple way to describe it would be that for light to get trapped in a black hole, the speed for light to leave must be faster than the speed at which the light is falling inside. So your speed relative to the speed of light gets closer together creating a similar effect as travelling close to the speed of light. I know it's not scientifically correct, but easier to understand if you accepted that part with time dilation due to traveling at speeds close to the speed of light in a vacuum.
This was a great vid Simon! For those that don't know already, PBS Spacetime has absolutely fascinating vids that delve a little deeper into singularities and the mind-melting mathematics and theories of traversing around or through them. Fairly accessible info even to me and my mere high school level education. 😂
Another little fun thing about black holes that I feel like I read an article about years ago but I'm unable to find now... they're (theoretically) instantaneous. From the perspective of the singularity, of course. They wink in and out of existence instantly. But the mass is so great that it stretches out time to billions, perhaps quadrillions of years from an external perspective. Which I think is also related to the theory of white holes; it sucks all matter in, "instantly", then spits it back out. I think the existence of hawking radiation makes the existence of white holes less likely, but that's getting into a scope of things that I can't even begin to fathom.
Hello Professor, would you please explain me a few things? Do you know about the Law of Conservation of Energy? So... what is "This" which is "Curving "Space? The origin of "This"? After, if Space is not Physical Medium but just an "Empty" Vacuum" What is Curving? Also, if Space is an Empty Vacuum How this "Empty" apply force on Material objects? Also, how and "Empty" Vacuum is Waving? The list is very long, but for the beginning Please! ANSWER THESE QUESTIONS, PLEASE!
I’d be interested in you making a video about Penrose’s black hole singularity theory and Kerr’s paper in response to that theory. Theories and ideas about the nature of black holes, geodesics, and singularities are fascinating and the work of Penrose and Kerr are equally so.
The mind blowing part of the time and gravity is also affected by relativistic speed. While astronauts are farther away from the core of the earth they are traveling very quickly... Mark Kelley - after spending a year on the ISS - is about 5 milliseconds younger than he would have been on the surface... Even though he was farther away from the core.
Ohoh, the twins road! I feel showing a road that runs up at an angle would show that so well, but maybe that wasnt a good spot for that visualization. All great stuff
That a man isn't smiling doesn't necessarily mean he is stupid! My impression is that you are a very intelligent man. Your videos are highly informative and extremely entertaining. Thanks.
The atomic clock at the peak of the mountain seems to run faster because it rotates faster, so moves faster in space than the atomic clock at see level. The more speed you have the more time difference you will have to an observer who moves slower, that's why the clocks in gps satellites have to get adjusted .
Isaac Asimov wrote an essay once about gravitational effects that caused scientists to consider the possibility of the "planet" Vulcan orbiting inside the orbit of Mercury. It was presented in a discussion of historical coincidences, but the final explanation was that the Sun's energy density was the source of the observed gravitation effects. It's an interesting read, if you can find it now.
You say in point 4 something like gravity causes time dilation, but I've heard it said it's actually the opposite. It's the time dilation that causes gravity. Gravity is what you get when you have 2 adjacent regions with time moving at different rates. It is the difference of the speed of time that causes you to move towards the mass, similar to how a boat in a stream would naturally curve towards the shore because the water is moving at a slower rate closer to the shore than in the middle.
I believe the time space curvature around an object is a function of the number of quantum events taking place in that proximity. The more mass there is, the more quantum events there are and the more temporal difference of potential between past and future is required. I analogize it to computing power. Your phone appeared to work fast when it was new and had the minimum stuff on it. As time went on, you put mote and more on it and system updates addrd complexity to virus scans and connection vetting software. This seemed to slow down your phenes functionality. However, to your phone, it still takes the same number of instructions to do what you told it to do. To it, there is now a percieved time dilation from when it was new. Only, it is basrd on multitasking the processing density instead of the quantum event density that i believe accounts for time space curvature. Sorry if it seems to support the simulation theory, but that aside, this seems to work for me.
I sorta get the effect gravity has on time. What I can't yet grasp is gravity's combined effect on spacetime. Space is warped as well, changing distances? Is there a relationship (math) expressing the correlation of mass's effect on space and time together?
Nice presentation. If I were to make it available to my collage students, I'd likely break it up in 5 short clips. As for the twin paradox ... so much to unpack with that. So, just one point. What we don't get to hear about is that in order for any human to get close enough to a black hole to experience time dilation on the scale of the movie Interstellar, they'd be close enough for the tidal forces to rip them apart and spaghettify in less time than it takes you to say "spaghettify". And, to be a tad more realistic, in the process of just moving toward the black hole, any spacecraft would have been torn apart long before it would even get to that location. To just get a tiny tiny bit of noticeable time dilation effect, you might be able to sustain the force of 2 gees on your body for a year or so. To summarize: While I love sci-fi, respectfully, Interstellar was trash science. We're making such a big deal about connecting space and time, but then praising a story that only looked at time and ignored space. And to elaborate, you wouldn't have to worry about falling past the event horizon because by the time you got there, you wouldn't be you anymore ... you would have been disintegrated into a tiny stream of plasma, not really caring much about how old you are. And one last detail. The escape velocity represents the velocity (kinetic energy) you need to completely escape a gravitational body. You don't need to move at escape velocity to just push away into an orbit. And once in orbit, the escape velocity is a little bit less. The esc.vel. of Earth is 11.19 km/s, but we watch rockets launch from the surface all the time that are not going that fast, because they are not trying to completely escape; they are just trying to get to an orbit above the surface ... where gravity is a tad weaker, and the esc.vel. is a bit smaller. In this way, it is conceivable to eventually get away. (Assuming you're actually a tiny particle and not a human being that has been torn to pieces.)
Thanks for this. "Mass distorts spacetime...Matter tells spacetime how to curve": These are misleading statements. Mass *IS* distorted spacetime; mass is "condensed" (metaphorically) spacetime, just as squeezing a sponge between two fingers creates a condensed node in the middle. The sponge node doesn't distort the sponge; the central dense node and the curvature of the sponge are a single structure. The same applies to matter. Matter doesn't curve spacetime; matter is condensed spacetime, which curves inwards towards the condensed node in its center. Matter is a manifestation of spacetime curvature, not a cause of spacetime curvature. (EM waves are also spacetime distortions, of a different type. In fact, EVERYTHING is spacetime, distorted. )
In another vid I watched, there was a weird discussion that if nothing goes faster than the speed of light - but working out orbitals you always assume gravity is instantaneous- start adding in any delays won't work...like an aircraft flying over the sound lags behind - so the source of gravity should look like it lags but it doesn't work....did my brain in..
The problem with time dilation is that it is indistinguishable from clock dilation. The clocks are based on the pulsing of atoms, and we are made of atoms, so for all practical purposes time can be said to stretch, but it is still possible to conceive a different definition of time such that it is unaltered by gravity and separate from our ability to measure with atomic clocks. To speak of 3D space being warped, we need to recognize that it has to have a 4th dimension to warp into and that the time dilations are too miniscule for time to be this dimension. That and the fact that gravity and time are two separate (though clearly related) phenomena are evidence for a 4th dimension of space. When we speak of gravity waves, it is the 3D surface of this 4D ocean in which these waves must be said to rise and fall, or rather, 3D not being 2D, expand and contract.
Although I don't dispute the possibility of more than 3 physical dimensions, it is also easy to visualize a stretching (warping) of a line in only one dimension. The same is true for 2 or 3 dimensional 'objects'.
The most memorable moments from interstellar 1. That black hole wild ride 2. When Matthew McConaughey catches up on 20 years of video messages 3. WTF MATT DAMON IS IN THIS
I think about Roger Penrose and how he said as a perticles speed increases, it's time slows. What if there is nothing beyond the even horizon, all particles falling in would accelerate to zero or near zero time. (Relative to all of us outside observers).
As for chapter 3, it's already known that c (the constant) is the speed of light in a vacuum, however light travels at different speeds through different mediums. The speed of light is different in air, as well as water, compared to a vacuum. I don't remember for sure, but I believe it's slower in air than a vacuum and slower in water than air, which is what causes diffraction (why when someone is in a pool and you look at them the part below the surface appears either distorted or to be in a different place than the part above the surface
So, if it was possible to fall into a black hole and during this fall you were able to look back at the point from which you fell, what would you see? One professor of physics has told me that we don't know for sure but there are a few hypotheses but it also depends on is this a spinning Black Hole or a non-spinning Black Hole, but for a non-spinning Black Hole, you might see the backside of yourself as those were the last photons that were at the Swartchild Radius and of course you would see points of light blink in and out of existence as stars would be born and go extinct as you plunge towards the singularity. If it is a spinning Black Hole he didn't have an answer of what would be possibly seen, because the way the Spacetime warps outside of a Swartchild Radius is not the same as we project inside a spinning Black Hole. I would love to hear people's ideas.
So, it sounds to me what your saying is time and space are separate. If gravitational waves rippled spacetime space and time would be effected equally and there still would have been no variation between the two halves of the light beam, it would extrude space and time in sync with each other so it would still be equivalent beams, it would just pass through us in no time at all. But if it rippled space and time remains the same, then it would make the two wavelengths different by being at the wrong place at the wrong time..right?
LQG predicts that there should be a difference between the most energetic photons, gamma rays, and lesser energetic ones like radio waves. The problem is that the difference in speed is less than 1.7⋅10^-15 times the speed of light. That would to work out to anywhere from a minute per billion years of travel to a few seconds. The problem is that we have a lot of GRBs (Gamma Ray Bursts) that are detected regularly. They also emit radio emissions as well. None of those measurements have ever been off. Either LQG needs to be fixed, or it's just plain wrong. I am still hoping it can be fixed.
I like to think of black holes like a spinning record or platter, where the outer diameter is moving faster than the speed of light by a lot and everything within is slower linearly. The Event Horizon is a little further out and due to gravitational 'drag' is moving at light speed only!
One very tangible application of SR and GR in our life is the GPS satellite system which clocks need correction everyday because of the satellite speed and distance from the surface.
Can someone help me understand this visualization of space-time curvature? The popular depiction of a heavy object curving a stretched fabric seems to me to assume a massive second object down somewhere that pulls the first heavy object downwards, creating this curvature! In the absence of such a second object, why would a single heavy object curve the space time? If indeed so, in which direction is such a curvature pointing? Because of the spherical symmetry at hand, the curvature should be along all directions equally, which means that the popular depiction fails miserably in presenting a true picture, because if we extend this picture in all direction, curvature at any point must be multivalued, which is obviously impossible. Then, how to visualize it better? Thanks in advance.
@13:30 According to the math, Miller's planet would have to be rotating around the black hole near its event horizon but in the movie it was several times further away... just saying
There are increasing signs that gravity may not be quantum. Oppenheim's recent work, for example. There are also increasing signs that black hole singularities can't actually exist. Kerr's recent work, for example.
Gravity is similar to touching. We don't physically touch each other or objects... just like gravity is not a force. The reason why we feel a sensation when we touch is the atoms in our skin and the electromagnetic forces. The common thread between the two concepts is the role of fields and interactions.
I know this is against everything we 'know' and have been taught, and at first glance seems insane.. but is it possible that neither space, time, nor spacetime are actual things and thus do not interact with matter or objects with mass? I'm not saying or claiming that this definitely is the case or that we are wrong. But is it possible that we are actually wrong about this? Are we really observing the warping or curvature of the fabric of spacetime or are we simply observing objects affecting each other? I look forward to hearing some comments and I'll explain my reason for considering this when I have a chance.
16:41 you meant to say "any other object of that mass", because since obviously densities differ, if a black hole of the same size as the sun replaced it, the solar system would very much collapse, as the black hole is so dense the gravitational pull on the other objects would be extraordinarily bigger.
Could someone answer a dumb question for me? If the problem with particle accelerators is they can't produce enough energy for quantum particle observation, can't we just put more chambers together? Is it just because the tubes are so large that there isn't a way to observe the combined energy of multiple collisions? My limited understanding is there are the tubes the particles accelerate through over however many miles, then collide when the two tubes are pointed towards each other with a bunch of scientific implements that allow the scientists to observe...whatever it is they actually observe when high energy blasts happen. Is it not possible to combine that observation point with another to observe even higher energy blasts? Thinking about it, it's probably because they'd have to time them super close together in order for the energy to feed off of each other and make the energy blast larger...probably the same reason they can't make a 4 way collider to do the same thing. Well I've already typed this all out so yup dumb question after all
In the end it's stated that past the event horizon you can't avoid the singularity because the speed needed exceed the speed of light. That's understandable. Earlier the allegory of a road with years is stretching more as the gravity increases. Doesn't that mean that it will take infinite time to travel to the singularity?
Pretty sure that gravity wave thing was interpreted wrong. Sun gone, things will fly apart instantly. That would be my prediction. Based on my understanding of laws of physics. Its sort of like this. Ya push an atom in on one side, and instantaneously, an atom comes out the other side...faster than the speed of light. The interferometer detected a ripple in the fabric. Doesnt necessarily mean gravity waves exist. We just know that some events cause a measureable ripple.
Think as it is as a point that is surrounded by levels, we exist on a level outside the point. As many other levels surrounded the point, the point is or has no time dilation, all past,present,future exist as one within the point that we exist outside of. We must progress through the levels of thought, we make it reality by observation.
I have a book on anti gravity, I can’t put it down
Annoyingly had to "like" this
@@warkatwargaming2358I couldn’t resist the bad joke
Horrible joke. Haha
😂hahahahaha
Heyyo
Fun fact: The ends of the LIGO arms are built up slightly higher than the surrounding landscape, because they had to be so straight, that they had to account for the curvature of the Earth.
It went from 900+ likes on the dad joke, 250 likes on a weird yo momma reference, and 20 ATM for a select few that had a bit of a nerd cringe moment, but also still laughes and voted for the inability to put the book down 1st because it's still funny laughing at stupid obvious yet *farts loudly*.... see what I mean?
Suck on that, flat earthers.
I wonder how the flat-Earthers explain that one away. 🤣
*gasp* The flerfers are going to get out their spirit levels.
Um...LIGO is underground. What "surrounding landscape" are you referring to?
Did not have Simon making a your mom joke on my bingo card for this year... That was great. Thanks for the laugh
I was shook
I actually LoL ed OUT LOUD! 😂
Physicist here. Congratulations to the writer Jehron B.! Very well done! Exceeded my expectations by a wide margin.
Fabric of spacetime, gravitational waves at LIGO, time being a material thing that "flows" at variable rates, black holes, dark matter, dark energy, Jesus H Christ it boggles the mind that people actually believe theoretical physics is a form of physics and cant see a mystical cult if it talked to them in a patronizing voice pretending the brain just can't grasp obvious contradiction because someone called it "counter-intuitive: *facepalm*
A white hole created each galaxy with matter from another universe as well as causing cosmic inflation. Today, our galaxy is slowly disappearing back down that black rabbit hole! :)> ... did you mean vini vedi vici? ... I came I saw, & she got everything?
@@lewis7315 And then the space wizard created a purple hole with pink spots and that's where leprechauns come from
Meh
I think that overall the quality of scripts for Simon's physics episodes have gone up. So he either hired better writers (more physics knowledgeable) or more thorough research is going into these. Some earlier episodes had some very obvious errors.
That was the funniest "yo mama" joke ever, just cause it came from you of all people. I am still laughing a minute later
Go watch brain blaze haha he's not just a fact boi
I couldn’t bring myself to laugh, but it was hilarious the writers made him say that with the editor# putting that gif in 😭
I wish so much i could laugh lough like people like you do.
It's funny,because it's true
Didn't expect that yo mama joke 😂
FUN FACT: Light travels faster than sound. This is why some people appear brighter...until they speak
Works both ways… words are worthless unless someone acts upon them through actions
Oh he even got a mom joke in😂
"OOOHHHHH, He said yo MAMA!"
I had to rewatch that part a couple of times because I was laughing too hard to hear the rest. Fact boi strikes again
Simon's mum is the great attractor
Trying to wrap my head around one of Simon’s sickest burns being on side projects and not BB or Decoding
That alone justifies my following of all his channels.
When I was watching the "Lost In Space" movie with my family, there was a scene in which the planet the ship was orbiting spontaneously (through technological means) collapsed into a black hole. This caused the *Jupiter 2* to begin falling into the newly formed, planet-massed black hole--ostensibly because of the increased gravity, because, well, it's now a black hole--instead of maintaining its original orbit. Out loud, I said, "Oh, COME ON!"
Everyone in the theater looked at me as if I had farted during a ballet.
Sometimes being a physicist makes life difficult...
Astro, any time you have more knowledge about a topic than others around you, you are weird. Example, watching the movie drop zone, I could tell where all the other skydivers were by their laughter during scenes that were supposed to be serious but skydivers knew to be impossible. The vast majority of people want to be the same, not correct.
So I know saying that the 4th dimension is time is not _exactly_ correct but is used as a way to explain it in layman's terms because it's very difficult to understand for the smartest of us, mainly because we are 3 dimension beings..
But could a better explanation be _Space/Time_ is the 4th dimension and _gravity_ is our _interaction_ with the 4th dimension? I'll stop there because any more and i will type out a book with ease! I have spent almost the last hour on only watching the 1st 5 minutes of this video, pausing, rewinding, pausing; my mind lost on this tangent revelation and trying to understand it, grasp it as best as I can with how extremely limited that is possible! We are just not physically able to observe this next higher dimension. And just as we cannot fully grasp what gravity is, this is because it is not a force as stated. It's not an actual "thing" as difficult to grasp as that is since we feel it every instance.. but calling the fundamental "forces" "interactions" instead, it makes it easier to visualize that gravity is only 2 or more (everything really) bodies interacting with each other in the 4th dimension, and we are experiencing the results of that/those interaction(s).
Any thoughts or ideas you would like to share would be amazing! Am I on the right track? Or am I just really high and need to get my life together because I'm talking craziness? 😂😂 my mind _is_ feel very fried right now, mostly from spending the last hour trying to understand the 4th dimension and how it explains gravity!! Only mostly tho 😅😊😁🫠 I feel I have barely said 2 words on this exploration of reality but already have the paragraphs I didn't want to start, it would be nothing to do 20 more and still only barely scratched the surface; so I will stop here!! Hope you are able to follow my thought process and I hope this helps others slightly grasp the idea(if I am right!?! 😂)
@@ronprince1478 what?? What are you talking about?? No, just because you enjoy falling thru life blindly ignorant of the world around you, doesn't mean "the vast majority," or even _ANYONE_ else feels the same!
And having knowledge and even _sharing_ knowledge is not weird.. there is just so much wrong with what you had said, _that_ is what is weird!!
@@jacobviator3118 I believe you when you say you are stoned, that comment was in support of the narrator stating what other people don’t understand is SEEN as being weird. I may fall through life (as a skydiver, pilot, GA, LSA, Glider, paraglider and hang glider pilot), but I don’t need mind altering drugs to cope with the real world.
@@ronprince1478 Same. I could spot the physicists in the theater by their laughter while watching *Gravity*.
1:22 The seldom-seen, often-feared Simon burn.
he was distracted by preparing himself for the "mom joke" :-)
E = mc^2 is not complete BTW. It is actually E^2 = (mc^2)^2 + p^2c^2 to account for massless particles.
momentum?
@@SDsc0rch Yes. Massless particles still can have momentum and energy (eg photons).
Momentum is included to account for kinetic energy, with massless particles being one of a large set of applications.
and the gammas are missing
@@richardnickerson4792 No, they're there: E=γm and p=γmv.
Fun fact. Gravity loses strength over distance but never reaches 0. So everything in the universe is pulling on you and vice versa.
@@danm7298 The Universe are, in particular, pulling our legs!
Cool, I didn't know this. Could this be used to determine ancient celestial objects that have long since disappeared from our view and figure out where they came from and went too?
@@johnhoppkins7258 No, because the pulls are soo small that you couldn't really measure them. They also somewhat equalize out over distances, so that the overall pull in any given direction that might happen to have greater mass, is even smaller. It's pretty much assured that some point in some direction has greater overall mass in that direction than any other direction, but it's impossible to determine. And even if you could somehow determine that, you still couldn't determine anything else about it, because it could be any configuration of any number of objects that make up that difference in pull. It's like having a ball pit where you're trying to determine what balls are exerting what pressure on others, without being able to touch or see the other balls, and without knowing how big or deep the ball pit is.
Since the location of the Gravity force cannot be found in the studies of classical knowledge and the effect of atoms at all, I assume, as the stupidest person in the world, that Gravity can be found in its basic quality through the quantum world. i.e. all of the gravity is probably in that area.
0:35 - Chapter 1 - It's not exactly a force
5:05 - Chapter 2 - Our theories fall apart at the quantum level
7:45 - Chapter 3 - It's also limited by the speed of light
12:20 - Chapter 4 - Gravity warps the passage of time
15:45 - Chapter 5 - It is most extreme in black holes
1:25 "your mum" joke.
Road runner + anvil + gravity = Flattened coyote.
Mass + momentum +headlight = Yikes!!
At least i can understand that!
The anvil and coyote were traveling straight through a curved spacetime!
I was just coming to say that wile e coyote and bugs Bunny taught me everything I need to know about gravity....
The Coyote should sue ACME
The mom joke caught me off guard and now i have to wipe coffe off of my phone.😂😂😂
“Do you hear that Mr. Anderson? That is the sound of inevitability.”
Didn't do Smith or Thanos any good
My name.... is.... neo.
@@askthepizzaguy Nemo? Is that you?
This is excellent. One of your best.
Another thing with Gravity, GPS has to take account of time dilation for both Special and General Relativity otherwise the accuracy would drift away rather quickly by about 2km per day.
Is it akin to the 15 degree per hour drift (thanks, Bob) discovered using a laser gyroscope?
@@sophierobinson2738 No, the 15 degree per hour "drift" is just due to the rotation of the earth. One full rotation of 360 degrees / 24 hours = 15 degrees per hour. It wouldn't be exactly 15 degrees due tot he difference between a sidereal day and a solar day.
Newtonian mechanics is fine for just about everything. You could fly to the moon just with newtonian mechanics. The gps system needs relativistic corrections because it uses time to determine location. The satellites broadcast the time using atomic clocks on the satellites and at ground stations. The receiver calculates the location based on the difference in time from different satellites. The satellites are moving fast in orbit, which causes their time to slow down slightly compared to on earth (special relativity), but they are also up much higher which causes their time to be slightly faster than on earth (general relativity).
The Deep Space Network, when using Doppler shifts to determine velocity for orbital determination, must apply a frequency offset that differs for each site, Australia versus California. The offset is derived from the gravity felt at each site. Density of the ground and elevation change the values of the apparent gravity at each site.
Yes, competing effects. Because the satellites are traveling in orbit faster than the ground receiver, special relativity says their clocks should be slower. But they are farther away from the gravity 'well' of earth, so their clocks should be faster. I forget off hand which one is larger, but it's also interesting that the eccentricity of their orbit (causing distance of satellite and its speed to vary) are also compensated.
@@jamescox8429 If A moves fast relative to B, then B moves fast relative to A. Is it A's or B's time that slows down? Basic question which is usually skipped by those who try to explain this.
Gravity: Just when I thought I was out, ... pull me back in!
I'm too old for this $#it!
Or I'm too far from a sufficiently large mass!!
That’s what I said to your mom.
Just like the lyric "you can check out any time you want, but you can't ever leave".
I think those 5 things are much more understood, thank to the hundreds of video describing them, than the everyday personal experience of being permanently pulled to the ground although we don't move, which is almost never explained in terms of spacetime curvature.
I very much appreciated the out-of-nowhere “Your Mom” joke. Definite LOL, rewind, repeat. Thanks for that moment of levity.
This was a great one Mr. Whistler, keep em coming!
That was heavy. Thanks for enlightening us.
Hey writers!
Super awkward timing (I know the time between script and release is delayed) but the “radiation” or light only black hole was just proven impossible in a paper released I think exactly a week ago, maybe 2 weeks ago. I’m not 100% certain if it was peer-reviewed yet but.. just so you know haha. Honestly with how much crazy space stuff has been figured out this year it can probably be a “10 discoveries this year (plus some corrections) video
The spectra of the speed of light has been solved for hundreds of years; the experiment to prove it merely requires a Prism creating a Rainbow.
Additionally, that concept of escaping the event horizon only accounts for static propulsion systems; a variable propulsion system could easily escape the inside of the event horizon via Orbital Slingshot Maneuver.
Have a good weekend everybody!
Hey, thanks!
😊
Ahhh... >raises finger< Your path may lead toward the singularity (there is evidence that the singularity can be orbited or bypassed) but it does NOT end with you MEETING the singularity. Space trades places with time and so the singularity remains forever IN YOUR FUTURE.
Great job on this one Simon🙏🏻
All he did was read the auto-que. He has a massive team of script writers and researchers, it’s them who deserve the credit.
Brilliant work. Thanks! Geaux Louisiana.
Best use of a Mom Joke in years...
Newton: "Gravity is so absurd no one can understand it."
Einstein: "Hold my violin."
"Entropy" next ?
Kyubey explained that perfectly fine!
Is was until it wasn't.
New theory: Is it possible, that spacetime is so curved in the black hole and especially near singularity (twisted into a huge knot), that path becomes "almost" infinite - so it's impossible to reach that dead end point and therefore singularity doesn't exist? For example expansion of the Universe (the fabric of spacetime) becomes bigger and bigger, so the "knot" can keep twisting and twisting? How about that? 3 beers and a new theory has born, and we solved the singularity problem :D
Does this guy ever stop making TH-cam videos. Like wtf.
Homeboy puts in a 40 hour work week for sure.
You must be new here. No, he does not stop, and he hasn't stopped for years. It's kind of insane, but there's always so much content and I love it
Simon is really a series of clones... The original Simon has been kicking back on a beach, sipping mimosas for at least 4 years now... 😂😂😂
Welcome to the Simon WhistlerVerse 😂 There are *so many* channels here. You'll never not have a video to watch again.
@@rj13bayne2 he NEEDS to make a logistics video on how he produced his videos.
BTW, by symmetry (and Gauss' Law), the Earth's gravity is zero at the center. It's estimated to continuously increase to a maximum of 10.7 m/sec**2 (due to denser inner core) and then settles down to about 9.8 m/sec**2 as it moves to the surface.
I once escaped from a black hole riding on a gravitational wave. They said it was impossible! I told them I didn't have time to explain. =].
Cool. Can actually someone far away, a distant observer see an object or a person crossing the event horizon? Or, the light from the crossing object would not ever leave so it becomes completely black? And does singularity really exist?
"Gravity doesn't work herf" is how i read the thumbnail
That danged shoulder….
@@sophierobinson2738 i swear Simo and team do these things on purpose and clearly obvious mispronunciation of commonly known words.
I grit my teeth and laugh every time🤣
Herf is a universal constant that is both an immovable object and an unstoppable force, moving at a speed 1mm/sec faster than the stated speed of light. This is why gravity doesn't work herf, herf works gravity.
@@theoriginalkyttyn7724 you actually got me laughing out loud! Nice one!🤣
@@joshuabrigden4820 I'm grateful to have given you the gift of mirth.
The "elastic sheet" visualization of the gravity field doesn't really show that the larger body (in a 2-body system) also moves about the barycenter. So we have to revert to the magical force at a distance.
Well this little video just cost me 57 years
One of Simon's videos is 7 years back on Earth!
I was a few days behind in viewing my favorite TH-cam content. I made my tea, grabbed a couple lemon cookies I'd made earlier in the day, turned on the TV and up popped "GRAVITY DOESN'T WORK HERF". I was trying my best to figure out what HERF meant (thinking it an unfamiliar acronym). Heavy Earthen Radial Fixtures? Then it hit me, I almost spilled my tea laughing at myself. As always, wonderful, well researched and well-presented content that is much appreciated.
The young picture of Einstein makes him look like he sells tweed covered furniture. Everything plaid.
Thanks for a great explanatory video!
Time dilation makes it so that even if you could somehow get out of a black hole, the universe would be over.
Thank you so much for this video. This is about where I am on understanding gravity and relativity so I appreciate how you laid it all out!
I like all your videos but this was the most thought provoking one ever, thanks.
Some of the most interesting and beautiful mathematics I have read in the last two decades was surrounding SuperString/ String theory. If beauty was a measurement of veracity then 100% we have strings.
I just had to stifle the most obnoxious laugh while listening to this at work because of the “Your mom” joke. That came out of nowhere.
@sideprojects, the second LIGO in the U.S. is located in Oregon, now Washington State :). Thank you for sharing this interesting topic!!
Could it be that smaller objects are more drawn to larger objects than larger objects but they appear to be equally drawn to each other. Like dust is drawn to objects in a room, (which may be by static electricity) - or is there a static attraction to gravity?
WHO IS HERF?
I'm herf
About time dilation with proximity to large masses, a simple way to describe it would be that for light to get trapped in a black hole, the speed for light to leave must be faster than the speed at which the light is falling inside. So your speed relative to the speed of light gets closer together creating a similar effect as travelling close to the speed of light.
I know it's not scientifically correct, but easier to understand if you accepted that part with time dilation due to traveling at speeds close to the speed of light in a vacuum.
This was a great vid Simon!
For those that don't know already, PBS Spacetime has absolutely fascinating vids that delve a little deeper into singularities and the mind-melting mathematics and theories of traversing around or through them. Fairly accessible info even to me and my mere high school level education. 😂
Another little fun thing about black holes that I feel like I read an article about years ago but I'm unable to find now... they're (theoretically) instantaneous. From the perspective of the singularity, of course. They wink in and out of existence instantly. But the mass is so great that it stretches out time to billions, perhaps quadrillions of years from an external perspective. Which I think is also related to the theory of white holes; it sucks all matter in, "instantly", then spits it back out. I think the existence of hawking radiation makes the existence of white holes less likely, but that's getting into a scope of things that I can't even begin to fathom.
Hello Professor, would you please explain me a few things? Do you know about the Law of Conservation of Energy? So... what is "This" which is "Curving "Space? The origin of "This"? After, if Space is not Physical Medium but just an "Empty" Vacuum" What is Curving? Also, if Space is an Empty Vacuum How this "Empty" apply force on Material objects? Also, how and "Empty" Vacuum is Waving? The list is very long, but for the beginning Please! ANSWER THESE QUESTIONS, PLEASE!
Gravity doesn't work herf
Get outta here flerf
Astronaught; moves 1 cm
The Event Horizon: that a move that you won't be able to financially recover from
Astroknot = hard to untie
I’d be interested in you making a video about Penrose’s black hole singularity theory and Kerr’s paper in response to that theory. Theories and ideas about the nature of black holes, geodesics, and singularities are fascinating and the work of Penrose and Kerr are equally so.
Kerr doesn't have much of a paper and what it does say was already pointed out by Hawking in the late 1960s.
The mind blowing part of the time and gravity is also affected by relativistic speed. While astronauts are farther away from the core of the earth they are traveling very quickly... Mark Kelley - after spending a year on the ISS - is about 5 milliseconds younger than he would have been on the surface... Even though he was farther away from the core.
Ohoh, the twins road!
I feel showing a road that runs up at an angle would show that so well, but maybe that wasnt a good spot for that visualization.
All great stuff
Simply one of the best presentations on gravity I've ever consumed, and I'm confident I've cut through many dozens.
That a man isn't smiling doesn't necessarily mean he is stupid! My impression is that you are a very intelligent man. Your videos are highly informative and extremely entertaining. Thanks.
The atomic clock at the peak of the mountain seems to run faster because it rotates faster, so moves faster in space than the atomic clock at see level. The more speed you have the more time difference you will have to an observer who moves slower, that's why the clocks in gps satellites have to get adjusted .
Isaac Asimov wrote an essay once about gravitational effects that caused scientists to consider the possibility of the "planet" Vulcan orbiting inside the orbit of Mercury. It was presented in a discussion of historical coincidences, but the final explanation was that the Sun's energy density was the source of the observed gravitation effects. It's an interesting read, if you can find it now.
Simon ... this is probably your best video yet.
You say in point 4 something like gravity causes time dilation, but I've heard it said it's actually the opposite. It's the time dilation that causes gravity. Gravity is what you get when you have 2 adjacent regions with time moving at different rates. It is the difference of the speed of time that causes you to move towards the mass, similar to how a boat in a stream would naturally curve towards the shore because the water is moving at a slower rate closer to the shore than in the middle.
I believe the time space curvature around an object is a function of the number of quantum events taking place in that proximity. The more mass there is, the more quantum events there are and the more temporal difference of potential between past and future is required.
I analogize it to computing power. Your phone appeared to work fast when it was new and had the minimum stuff on it. As time went on, you put mote and more on it and system updates addrd complexity to virus scans and connection vetting software. This seemed to slow down your phenes functionality. However, to your phone, it still takes the same number of instructions to do what you told it to do. To it, there is now a percieved time dilation from when it was new. Only, it is basrd on multitasking the processing density instead of the quantum event density that i believe accounts for time space curvature. Sorry if it seems to support the simulation theory, but that aside, this seems to work for me.
I sorta get the effect gravity has on time. What I can't yet grasp is gravity's combined effect on spacetime. Space is warped as well, changing distances? Is there a relationship (math) expressing the correlation of mass's effect on space and time together?
Nice presentation. If I were to make it available to my collage students, I'd likely break it up in 5 short clips.
As for the twin paradox ... so much to unpack with that.
So, just one point. What we don't get to hear about is that in order for any human to get close enough to a black hole to experience time dilation on the scale of the movie Interstellar, they'd be close enough for the tidal forces to rip them apart and spaghettify in less time than it takes you to say "spaghettify". And, to be a tad more realistic, in the process of just moving toward the black hole, any spacecraft would have been torn apart long before it would even get to that location. To just get a tiny tiny bit of noticeable time dilation effect, you might be able to sustain the force of 2 gees on your body for a year or so. To summarize: While I love sci-fi, respectfully, Interstellar was trash science.
We're making such a big deal about connecting space and time, but then praising a story that only looked at time and ignored space.
And to elaborate, you wouldn't have to worry about falling past the event horizon because by the time you got there, you wouldn't be you anymore ... you would have been disintegrated into a tiny stream of plasma, not really caring much about how old you are.
And one last detail. The escape velocity represents the velocity (kinetic energy) you need to completely escape a gravitational body. You don't need to move at escape velocity to just push away into an orbit. And once in orbit, the escape velocity is a little bit less. The esc.vel. of Earth is 11.19 km/s, but we watch rockets launch from the surface all the time that are not going that fast, because they are not trying to completely escape; they are just trying to get to an orbit above the surface ... where gravity is a tad weaker, and the esc.vel. is a bit smaller. In this way, it is conceivable to eventually get away. (Assuming you're actually a tiny particle and not a human being that has been torn to pieces.)
Thanks for this. "Mass distorts spacetime...Matter tells spacetime how to curve": These are misleading statements.
Mass *IS* distorted spacetime; mass is "condensed" (metaphorically) spacetime, just as squeezing a sponge between two fingers creates a condensed node in the middle. The sponge node doesn't distort the sponge; the central dense node and the curvature of the sponge are a single structure. The same applies to matter. Matter doesn't curve spacetime; matter is condensed spacetime, which curves inwards towards the condensed node in its center.
Matter is a manifestation of spacetime curvature, not a cause of spacetime curvature.
(EM waves are also spacetime distortions, of a different type. In fact, EVERYTHING is spacetime, distorted. )
The time dilation in Interstellar was also due to velocity. As you accelerate while dropping inho a gravity meln.
17:47... Had me in tears!
No BS, no gimmicks, to the point and easy to understand. Appreciate your work, mate. Thank you.
That mum joke came outta nowhere, fuckin' killed me yo
Simon I hope you see this but around 13:00 every time you say Observer it reminds me of Fringe. A show you & I both love.
In another vid I watched, there was a weird discussion that if nothing goes faster than the speed of light - but working out orbitals you always assume gravity is instantaneous- start adding in any delays won't work...like an aircraft flying over the sound lags behind - so the source of gravity should look like it lags but it doesn't work....did my brain in..
The problem with time dilation is that it is indistinguishable from clock dilation. The clocks are based on the pulsing of atoms, and we are made of atoms, so for all practical purposes time can be said to stretch, but it is still possible to conceive a different definition of time such that it is unaltered by gravity and separate from our ability to measure with atomic clocks.
To speak of 3D space being warped, we need to recognize that it has to have a 4th dimension to warp into and that the time dilations are too miniscule for time to be this dimension. That and the fact that gravity and time are two separate (though clearly related) phenomena are evidence for a 4th dimension of space. When we speak of gravity waves, it is the 3D surface of this 4D ocean in which these waves must be said to rise and fall, or rather, 3D not being 2D, expand and contract.
Although I don't dispute the possibility of more than 3 physical dimensions, it is also easy to visualize a stretching (warping) of a line in only one dimension. The same is true for 2 or 3 dimensional 'objects'.
The most memorable moments from interstellar
1. That black hole wild ride
2. When Matthew McConaughey catches up on 20 years of video messages
3. WTF MATT DAMON IS IN THIS
17:28 excuse me sir, you mean bounce off your head, I have luscious locks on mine which renders light inescapable
I think about Roger Penrose and how he said as a perticles speed increases, it's time slows. What if there is nothing beyond the even horizon, all particles falling in would accelerate to zero or near zero time. (Relative to all of us outside observers).
Great vid! The warping of time causing gravity for the 6th thing.
As for chapter 3, it's already known that c (the constant) is the speed of light in a vacuum, however light travels at different speeds through different mediums. The speed of light is different in air, as well as water, compared to a vacuum. I don't remember for sure, but I believe it's slower in air than a vacuum and slower in water than air, which is what causes diffraction (why when someone is in a pool and you look at them the part below the surface appears either distorted or to be in a different place than the part above the surface
So, if it was possible to fall into a black hole and during this fall you were able to look back at the point from which you fell, what would you see? One professor of physics has told me that we don't know for sure but there are a few hypotheses but it also depends on is this a spinning Black Hole or a non-spinning Black Hole, but for a non-spinning Black Hole, you might see the backside of yourself as those were the last photons that were at the Swartchild Radius and of course you would see points of light blink in and out of existence as stars would be born and go extinct as you plunge towards the singularity. If it is a spinning Black Hole he didn't have an answer of what would be possibly seen, because the way the Spacetime warps outside of a Swartchild Radius is not the same as we project inside a spinning Black Hole. I would love to hear people's ideas.
So, it sounds to me what your saying is time and space are separate. If gravitational waves rippled spacetime space and time would be effected equally and there still would have been no variation between the two halves of the light beam, it would extrude space and time in sync with each other so it would still be equivalent beams, it would just pass through us in no time at all. But if it rippled space and time remains the same, then it would make the two wavelengths different by being at the wrong place at the wrong time..right?
LQG predicts that there should be a difference between the most energetic photons, gamma rays, and lesser energetic ones like radio waves. The problem is that the difference in speed is less than 1.7⋅10^-15 times the speed of light. That would to work out to anywhere from a minute per billion years of travel to a few seconds. The problem is that we have a lot of GRBs (Gamma Ray Bursts) that are detected regularly. They also emit radio emissions as well. None of those measurements have ever been off. Either LQG needs to be fixed, or it's just plain wrong. I am still hoping it can be fixed.
I have never heard time dilation explained so simply and clearly.
I like to think of black holes like a spinning record or platter, where the outer diameter is moving faster than the speed of light by a lot and everything within is slower linearly.
The Event Horizon is a little further out and due to gravitational 'drag' is moving at light speed only!
One very tangible application of SR and GR in our life is the GPS satellite system which clocks need correction everyday because of the satellite speed and distance from the surface.
Can someone help me understand this visualization of space-time curvature? The popular depiction of a heavy object curving a stretched fabric seems to me to assume a massive second object down somewhere that pulls the first heavy object downwards, creating this curvature! In the absence of such a second object, why would a single heavy object curve the space time? If indeed so, in which direction is such a curvature pointing? Because of the spherical symmetry at hand, the curvature should be along all directions equally, which means that the popular depiction fails miserably in presenting a true picture, because if we extend this picture in all direction, curvature at any point must be multivalued, which is obviously impossible. Then, how to visualize it better? Thanks in advance.
@13:30 According to the math, Miller's planet would have to be rotating around the black hole near its event horizon but in the movie it was several times further away... just saying
There are increasing signs that gravity may not be quantum. Oppenheim's recent work, for example.
There are also increasing signs that black hole singularities can't actually exist. Kerr's recent work, for example.
Gravity is similar to touching. We don't physically touch each other or objects... just like gravity is not a force.
The reason why we feel a sensation when we touch is the atoms in our skin and the electromagnetic forces. The common thread between the two concepts is the role of fields and interactions.
I know this is against everything we 'know' and have been taught, and at first glance seems insane.. but is it possible that neither space, time, nor spacetime are actual things and thus do not interact with matter or objects with mass?
I'm not saying or claiming that this definitely is the case or that we are wrong. But is it possible that we are actually wrong about this?
Are we really observing the warping or curvature of the fabric of spacetime or are we simply observing objects affecting each other?
I look forward to hearing some comments and I'll explain my reason for considering this when I have a chance.
16:41 you meant to say "any other object of that mass", because since obviously densities differ, if a black hole of the same size as the sun replaced it, the solar system would very much collapse, as the black hole is so dense the gravitational pull on the other objects would be extraordinarily bigger.
I really didn't understand any of this but, found it incredibly interesting. Thanks, @Simon Whistler.
Could someone answer a dumb question for me?
If the problem with particle accelerators is they can't produce enough energy for quantum particle observation, can't we just put more chambers together? Is it just because the tubes are so large that there isn't a way to observe the combined energy of multiple collisions? My limited understanding is there are the tubes the particles accelerate through over however many miles, then collide when the two tubes are pointed towards each other with a bunch of scientific implements that allow the scientists to observe...whatever it is they actually observe when high energy blasts happen. Is it not possible to combine that observation point with another to observe even higher energy blasts?
Thinking about it, it's probably because they'd have to time them super close together in order for the energy to feed off of each other and make the energy blast larger...probably the same
reason they can't make a 4 way collider to do the same thing. Well I've already typed this all out so yup dumb question after all
In the end it's stated that past the event horizon you can't avoid the singularity because the speed needed exceed the speed of light. That's understandable. Earlier the allegory of a road with years is stretching more as the gravity increases. Doesn't that mean that it will take infinite time to travel to the singularity?
4:56 I feel John Archibald Wheeler missed an opportunity to make a Douglas Adams style joke about matter telling space time to "get bent."
16:15 except that everything that enters a black hole escapes eventually in the form of hawking radiation, which is the means of their evaporation
Pretty sure that gravity wave thing was interpreted wrong. Sun gone, things will fly apart instantly. That would be my prediction. Based on my understanding of laws of physics. Its sort of like this. Ya push an atom in on one side, and instantaneously, an atom comes out the other side...faster than the speed of light. The interferometer detected a ripple in the fabric. Doesnt necessarily mean gravity waves exist. We just know that some events cause a measureable ripple.
Think as it is as a point that is surrounded by levels, we exist on a level outside the point. As many other levels surrounded the point, the point is or has no time dilation, all past,present,future exist as one within the point that we exist outside of. We must progress through the levels of thought, we make it reality by observation.