I started reading Sagan's The Cosmos to my now 1 1/2 year old granddaughter a couple months ago. I shall begin to have her watch the series this Summer in between our time in the backyard garden.
I used to watch this happily with my parents when I was a child. I remember this scene very vividly. I'm amazed to see it again on youtube after all these years.
Hans Zimmers "Leave No Man Behind" from Black Hawk Down would be perfect music for this sequence. For people to benefit from relativistic space flight @ near light speeds they must go on the trip
This is my favorite part of the entire series. As a kid in the early 80s when I was 6-8 years old I watched this and left it with a far greater understanding of science than of people I knew in my daily life. We didn't have the word Autistic then so I didn't know I was that but I had no idea why people did what they did but I understood this stuff.
"Pauulo says good bye to his little brother Vinchennnzo" I don't know why but I love listening to him say it like that haha. He almost had somewhat of a regal way of speaking
I still recall getting a chuckle out of that when me and my mom watched the original airing of Cosmos. Always had to be SO precise. The best occurs when he enunciates the !Kung tribe of the Kalahari-he must have practiced in front of mirror for hours, because the proper naming requires a special “clucking” sound with the tongue and the roof of the mouth. What a hoot Carl Sagan was!
That’s awesome! I was also duly inspired by Dr. Sagan-went on to read 9 or 10 of his books, then read Asimov, Wheeler, Kaufmann, Gribbin, Hawking, Calder and many more-and became a soil scientist in the employ of the USDA/NRCS for 32 years.
Carl Sagan agrees with you! That's why he wrote books and starred in television shows, he wanted everyone to think critically as he did. It's up to us to embody the Sagan wisdom in ourselves as well as waiting for another Sagan type scientist to take Carl's old position.
My father introduced me to this video when I was about 12 or 13 years old. I was old enough to understand what they were suggesting, but not quite old enough to stick around long enough to realize that we can't really travel at the speed of light yet. So, naturally, I went and got my scooter--motor powered. I considered replicating what I'd seen here (or attemtping to) but then decided not to, because I didn't want to age so slowly while everyone I loved aged and withered away.
It's so mind blowing that the universe has provided a possibility that a human could travel to another star in their lifetime, given they could travel close to speed of light.
I was a little kid when this was on telly. I loved it, and I'm not sure why, because I hadn't really any clue what that Carl Sagan fella was going on about. But I remember I found his voice comforting, maybe because I thought he sounded a bit like Kermit the Frog at the time (though he doesn't really, but then again I am foreign). And also I liked Paolo and his magic red/blue scooter. A slice of my happy childhood suddenly in my mind again. Thank you for posting this video and giving me that.
I understand how Rick Springfield seems to never age a day from this Cosmos episode. Rick must be always travelling near the speed of light. Rick is in his mid 70's yet he looks 20 something.
Carl Sagan es un científico fascinante, por su trabajo (incansable) en la investigación y la divulgación científica en los campos de la astronomía, exobiologia, radioastronomia, la investigación de las ondas del sonido (el efecto dopler), el viaje en el tiempo a la velocidad de la Luz, (como en este caso del vídeo), la vida extraterrestre inteligente más allá de nuestro planeta tierra, y tantísimos otros temas muy interesantes, les envío muchos saludos desde la provincia de Buenos Aires República Argentina 🇦🇷
A similar thing maybe I experienced. When I was younger I enjoyed the game Centipede which was an arcade game in the 80s but my workplace had one. I played it every day so I got to be very good at it. It is a very fast-moving hand eye game. I would get so into it and get into a kind of zone. Everything was moving fast but somehow my brain would experience it as everything moving slow I was totally immersed. I'm sure there is a name for this and perhaps sport players experience it all the time.
that is science fiction. travelling far into space will not change how fast you age. if you are 40 and it takes you 60 earth years to fly somewhere, you will still be 100 by the time you get there, and will look like it too, if you're not already dead from old age before then. If you could fly to that place in 1 minute, and be back in 1 minute, you and everyone else on earth, would still be 2 minutes older than you all were before you left.
@@shaquadradeloiserussell8659if you traveled away from Earth at light speed for 1 minute, then return to Earth at light speed for the same amount of time almost 100 days would have passed on Earth in those two minutes.
@@shaquadradeloiserussell8659 You don't understand. It's not about travelling far, but travelling fast. If you could circle the earth 7 times per second, you'd get the same effect.
@theseaotter He was a master at explaining brilliant and complicated thoughts and ideas ina way that common folks like us could understand and that's a rare gift.. hopefully there will be another like him..
We hear an audible red and blue shift everyday as a sound wave. Listen to a car traveling on a road. You hear a high pitched noise as it approached, you hear an almost "exhale" lowered pitch as it passes. You have witnessed the effect Sagan is talking about. If we are in that car, our field of vision narrows due to speed relative to a "static" earth. Such a great video, thanks.
> If we are in that car, our field of vision narrows due to speed relative to a "static" earth. No it doesn't. The effect Carl is talking about, where things that are behind you appear in front of you, only happens at very near the speed of light. It doesn't occur at the incredibly sluggish speed of cars.
Watched this as a senior in high school when it came out. Of course, my dad couldn’t understand it and hated watching it. My mother watched only because of Carl’s voice. Science was my thing, not theirs.
I dont want anybody to think that they would be in some kind of twilight zone when traveling close to c. To you, your watch is ticking normally, to an observer, your watch ticks very slow.
I have a practically overwhelming amount of memories of this ORIGINAL version of COSMOS. Nothing but respect though for the Neil DeGrasse Tyson version.😎👍🏻
We are traveling at speed. Sitting here I am moving at the speed of the earth's rotation. And the speed of the earth's orbit around the sun. And the speed of the solar system around the galaxy center. And the speed of the expanding universe. Speed is relative to the observer. Where's the observer?
The while thing about time dilation, how do we know we age slower rather than just perceive time slower? Could it be that we start aging before our very eyes if we were in front of a mirror, rather than staying young despite our surroundings progressing through time?
If you were to travel at exactly light speed, time actually *would* stop for you. Getting to the speed of light, however, would require more energy than exists in the universe.
Carl Sagan explains such complicated theories in such simple ways that people with almost no knowledge of physics and cosmology can easily understand what he is trying to explain.
How did his brother survive all that time on the bench? What did he eat? Where did he poop? I hope the new version of Cosmos answers these loose threads.
Obviously, younger brother Vincenzo did not stay on the bench for fifty years. While Paulo took his relativistic ride, Vincenzo went on with his life, but returned to the bench at the same time every day, waiting for Paulo to return. The time dilation effects of special relativity led to a poignant reunion.
Don't buy oil of olay to prevent ageing. Just travel at the speed of light for half hour!! Seriously though, what a magnificent video. This boggles my mind and makes no sense but it's all true which is a mindfeck.
If Paolo's Scooter got 60 miles per gallon, and he traveled the Speed of Light for just 10 minutes he would need a fuel tank that held about 2 quadrillion gallons of gas! What a great video. Mind expanding to think that Time does pass at such different rates and some brilliant minds discovered this with just pencil and paper (or chalk and blackboard) to do the requisite mathematics...
@justinjiang, the watch doesn't slow down. An outside observer who looked at the traveller's watch would see that the watch was ticking slower than usual, while the traveller wouldn't see this slow-down. He would actually see the surrounding world a tad faster!
No it wouldn't. 'Time' does not have one definition. It is all relative to each individual object, and yet it is also relative to all objects at once. Its all down to perspective.
@Galentw that's what I still cannot understand. Traveling at the speed of light to an observer would actually be considered a very slow way to travel if time for them goes by faster than for those traveling at near light speed.
We need more people like Sagan and less dirtbag politicians and middle eastern dictators. In 1000 years we will either by far more advanced then we could ever dream, or we will be consigned to dwell on our weaknesses rather then our strengths.
@justinjiang, no. according to Einsten's theories, time is stretched out for the fast-traveller. That would make his clock running late. Anything else unclear? I've heard that the clocks onboard human-built satellites in Earth's orbit need to be readjusted continually because their shift in space-time. I also heard about a cosmonaut being in Earth's orbit for such a long time that his time had shifted a few milliseconds (comparing to ours).
to a person who is observing a ship approaching the speed of light would the ship seem as though it is slowing down as it is getting closer to light speed because time is slowing down to the ship so the observer would see this as well? Another way to put it is there is a track the ship and the people on it are travelling around this track at light speed to them the journey only takes 4 mins from point A to B but to the oberservers it takes hours so to the observers would the ships slower than..
there's agood example about this. Imagine you watch a clock; what you see is the light that goes to the clock and then to your eyes, so you see it's moving; but if you go to the speed of light wlaking away from it and watching it, you'll see the same time always, until you stop, because you're going at the same speed of the image you received when you was in front of the clock (of course in real life you wouldn't be able to see the clock because of the distance, unless is a big star size clock)
In short, light is always traveling the same speed, then again we define space and time by light so light is always going straight too, it's the universe that curves and slows down. Sidenote for anyone interested With the LHC now its cool, H+ going ~the speed of light, get added energy, so they, instead of going faster, expand in size.
With our current understanding of the world, it seems humans wouldn't survive the journey, yet this is an imaginative journey. Still, it is assumed that we can suvive the journey and the person traveling wouldn't die of old age since time outside your scope would pass faster relative to you, but your experience within the fast speed would seem normal.
most common example is astronauts and space satellites. Astronauts in their average career will have travelled fowards in time by 20 hours... also the time on satellites have to be constantly adjusted to match a master clock on the earth. The time onboard a satellite creeps ahead into the future because of the speed they travel at all the time.. this is everyday stuff
QUESTION! Therefore, if we do ever travel close to the speed of light and go to a plat, let's say 1000 light years away. Did we simply age of a few years in that case? which would make it possible for use to travel long distance in once lifetime? (without the help of worm holes)
You'd see either a black or white TV screen, since its a recording of light waves and refections, - Not real life. All colors would blend, to the human eye watching the TV. No light waves would accually be distorted.
@onlynameithoughtof That is a really confusing paradox: instead of traveling fast to save time, one would have to give many years to light speed to be able to travel in a destination that would feel like a short time.
I see what you're saying, that all speeds are relative, but it seems we don't see that effect and light does travel that fast :-) I don't know, I am surely missing something with this relative speed thing, but I am unable to say what, except I have a feeling it has to do with the energy put into it.
If you held a mirror in front of your face while you traveled at the speed of light would you be able to see your reflect? The Church of Sagan! All hail Carl! CC!
Figuratively speaking, if somebody was at the top of an escalator, they would age more slowly than someone at the bottom of the escalator. It wouldn't be noticeable to us, but the effect would take place.
No it wouldn't. Just because its 12 a.m. in central time zone in America, and its 12 p.m. in Indonesia, does not literally mean Indonesia is 12 hours into the future. 12 a.m. here is exactly the same time as 12 p.m. there. If you don't believe it try doing a video call with somebody in Indonesia. Light years cover distances not time. Which is weird, because Carl Sagan himself said that on the first episode. So this time travelling crap is a complete contradiction.
@@shaquadradeloiserussell8659 Hmmm the documentary I saw was talking about distance from above the Earth and that the higher we get, the slower time passed. It had nothing to do with alternate time zones.
@@RobCLynch If you are somewhere in space other than here, then you are in another time zone; DEPENDING how you're looking at it. Two separate places will have their own time, and yet the two places are both on the same frame of time as far as the galaxy or universe sees it. That's why there is a popular phrase in Physics: "Time is relative'. It does not have one , nor two, definitions. People confuse speed with time, the same way they confuse light with the source that provides the light. Is a light bulb the light , or is it that stuff that's shining on the walls and floor?
@@RobCLynch Also... the theory about "Time slowing down" the further one travels in space, merely because they saw a watch slowing down, could most likely not be because time is literally slowing down, but the immense speed and pressure is causing the watch to malfunction; The same as it affects your heart and other organs. That's another thing think about if planning a deep deep space travel: CAN this vessel actually make it that far without succumbing to damage?
Every time you change direktion you will have to use power. You will have to deaccerate and use power to go back to the point of the beginning. Travelling near the speed of light - where should that power come from?
If time slows down for the pilot of a nearly lightspeed vehicle, will an observer clock the ship traveling slower or faster than the pilot would clock the ship traveling? And how much is the difference? And does this mean that we could travel a lightyear in less than a year from our perspective?
Each one sees the other’s clock slows down, and each one also sees the other contract in the direction of motion. Pilot records less time travelling from point A to point B, because an observer stationary relative to those points sees the pilot’s clock run slow. But the pilot sees that it is because the points are closer together.
@@lawrencedoliveiro9104 I just realized that the pilot would perceive his or her ship as traveling faster than the speed of light. I wonder what that looks like.
@RotaryKnight Wrong. Newtonian physics state that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an outside force. If you were to suddenly accelerate to the speed of light, you would disintegrate because of this law. Your body does not want to go that fast. The acceleration of 0 to 183000 miles per second would tear you to shreds. The Force would be infinity. F = ma. If a is infinite, then you have infinite force on you.
no mate. to you, that 8 mins would be like just a few seconds or less, but in reality, its still 8 mins. your bio clock ticks slower, that means you "degrade" slower. but if you were travelling for 8 mins according to you (your bio clock), then yes, you would find your frends old.
You don't need to go that far. Since acceleration and gravity are the same thing in space-time (by Einstein's Theory of General Relativity), you can do the test with two atomic clocks at different heights. Since being closer to a gravity well distorts space-time the same way going fast does, the clock at the top of a skyscraper ticks faster than one at the bottom. This becomes a very real issue with GPS satellites, which fall behind by 7 microseconds each day, translating to 10km of inaccuracy.
what it actually is going?? Because in a way you actually arnt travelling any faster, just say you find out someone close to you is dieing and you obviously wan to reach them in the quickest way possible, so lets say you use light speed yes to you, you arrive extreemely quick but to the observer you are delayed and might even miss there passing?? This stuff interests me but is confusing, someone care to explain?
correct me if I'm wrong PLEASE. :) but wouldn't a human simply DIE if he travelled close to the speed of light? Einstein's theory of relativity states that the faster you go, the heavier you get. So let's say that you are travelling in such a speed so that your weight is 1000000 heavier (quite close to the speed of light). Thus any movement (at all) would mean huge changes of chinetic and potential energy.Would the heart be able to pump the blood around?Would an arm-stretch tear the body aparty?
I started reading Sagan's The Cosmos to my now 1 1/2 year old granddaughter a couple months ago. I shall begin to have her watch the series this Summer in between our time in the backyard garden.
I used to watch this happily with my parents when I was a child. I remember this scene very vividly. I'm amazed to see it again on youtube after all these years.
How's life been these last 11 years?
@@freshtoast3879 it's getting worse
@@dragospahontu no doubt
Hans Zimmers "Leave No Man Behind" from Black Hawk Down would be perfect music for this sequence. For people to benefit from relativistic space flight @ near light speeds they must go on the trip
So you believe if you say vividly you become as smart as sagan?
Carl Sagan was a genius at communication.
Perhaps the greatest science popularizer of all, even possibly a level up from Isaac Asimov.
He was uniquely sincere, with all the competence in the world.
Paulo got places to BE
Hilarious comment. 😂
The world REQUIRES more people like Carl Sagan. Let us all find more ways to cultivate and to nourish people like him. 🙂
Hear, Hear!
So brilliantly explained in simple terms. Cosmos is still, today, one of the greatest popular science shows ever made.
This is my favorite part of the entire series. As a kid in the early 80s when I was 6-8 years old I watched this and left it with a far greater understanding of science than of people I knew in my daily life. We didn't have the word Autistic then so I didn't know I was that but I had no idea why people did what they did but I understood this stuff.
"Pauulo says good bye to his little brother Vinchennnzo" I don't know why but I love listening to him say it like that haha. He almost had somewhat of a regal way of speaking
I still recall getting a chuckle out of that when me and my mom watched the original airing of Cosmos. Always had to be SO precise. The best occurs when he enunciates the !Kung tribe of the Kalahari-he must have practiced in front of mirror for hours, because the proper naming requires a special “clucking” sound with the tongue and the roof of the mouth. What a hoot Carl Sagan was!
I saw it when I was younger n today 2022, I'm now a data scientist for NASA. Carl influenced.
That’s awesome! I was also duly inspired by Dr. Sagan-went on to read 9 or 10 of his books, then read Asimov, Wheeler, Kaufmann, Gribbin, Hawking, Calder and many more-and became a soil scientist in the employ of the USDA/NRCS for 32 years.
What a legend Carl Sagan is... World needs more like him!
Carl Sagan agrees with you! That's why he wrote books and starred in television shows, he wanted everyone to think critically as he did. It's up to us to embody the Sagan wisdom in ourselves as well as waiting for another Sagan type scientist to take Carl's old position.
Can still remember watching this as a kid and being blown away
My father introduced me to this video when I was about 12 or 13 years old. I was old enough to understand what they were suggesting, but not quite old enough to stick around long enough to realize that we can't really travel at the speed of light yet.
So, naturally, I went and got my scooter--motor powered. I considered replicating what I'd seen here (or attemtping to) but then decided not to, because I didn't want to age so slowly while everyone I loved aged and withered away.
It's so mind blowing that the universe has provided a possibility that a human could travel to another star in their lifetime, given they could travel close to speed of light.
I was a little kid when this was on telly. I loved it, and I'm not sure why, because I hadn't really any clue what that Carl Sagan fella was going on about. But I remember I found his voice comforting, maybe because I thought he sounded a bit like Kermit the Frog at the time (though he doesn't really, but then again I am foreign). And also I liked Paolo and his magic red/blue scooter.
A slice of my happy childhood suddenly in my mind again. Thank you for posting this video and giving me that.
italian restaurant service slows down at noon. great presentation to make it memorable. and also a bit of cultural exchange.
I understand how Rick Springfield seems to never age a day from this Cosmos episode. Rick must be always travelling near the speed of light. Rick is in his mid 70's yet he looks 20 something.
This episode got me hook on Cosmos and the speed of light.
Carl Sagan es un científico fascinante, por su trabajo (incansable) en la investigación y la divulgación científica en los campos de la astronomía, exobiologia, radioastronomia, la investigación de las ondas del sonido (el efecto dopler), el viaje en el tiempo a la velocidad de la Luz, (como en este caso del vídeo), la vida extraterrestre inteligente más allá de nuestro planeta tierra, y tantísimos otros temas muy interesantes, les envío muchos saludos desde la provincia de Buenos Aires República Argentina 🇦🇷
Totally fascinating; everyone should watch these vids!
Traveling at the speed of light. Awesome. :D
A similar thing maybe I experienced. When I was younger I enjoyed the game Centipede which was an arcade game in the 80s but my workplace had one. I played it every day so I got to be very good at it. It is a very fast-moving hand eye game. I would get so into it and get into a kind of zone. Everything was moving fast but somehow my brain would experience it as everything moving slow I was totally immersed. I'm sure there is a name for this and perhaps sport players experience it all the time.
Yes, behavioral scientists refer to the phenomenon as tachypsychia.
Love Carl Sagan...RIP...
I really enjoy the beautiful Italian sights
Sagans best ever series!
This has honestly got to be one of the most trippiest scenes from this series. Change my mind.
Only after I saw interstellar I realised how hard it would really be to experience something like that.
that is science fiction.
travelling far into space will not change how fast you age.
if you are 40 and it takes you 60 earth years to fly somewhere, you will still be 100 by the time you get there, and will look like it too, if you're not already dead from old age before then.
If you could fly to that place in 1 minute, and be back in 1 minute,
you and everyone else on earth, would still be 2 minutes older than you all were before you left.
@@shaquadradeloiserussell8659if you traveled away from Earth at light speed for 1 minute, then return to Earth at light speed for the same amount of time almost 100 days would have passed on Earth in those two minutes.
Theoretically
@@SiphiliSx
No it would not have.
One Earth minute is still one Earth minute, regardless where ever you are in the universe.
@@shaquadradeloiserussell8659 You don't understand. It's not about travelling far, but travelling fast. If you could circle the earth 7 times per second, you'd get the same effect.
@theseaotter He was a master at explaining brilliant and complicated thoughts and ideas ina way that common folks like us could understand and that's a rare gift.. hopefully there will be another like him..
Very fascinating, thanks!
We hear an audible red and blue shift everyday as a sound wave. Listen to a car traveling on a road. You hear a high pitched noise as it approached, you hear an almost "exhale" lowered pitch as it passes. You have witnessed the effect Sagan is talking about. If we are in that car, our field of vision narrows due to speed relative to a "static" earth. Such a great video, thanks.
Yep the Doppler effect affects light waves and sound waves :D
> If we are in that car, our field of vision narrows due to speed relative to a "static" earth.
No it doesn't. The effect Carl is talking about, where things that are behind you appear in front of you, only happens at very near the speed of light. It doesn't occur at the incredibly sluggish speed of cars.
Watched this as a senior in high school when it came out. Of course, my dad couldn’t understand it and hated watching it. My mother watched only because of Carl’s voice. Science was my thing, not theirs.
I remember watching this while in my 8th grade science class. This explained things so much.
Your second sentence is masterfully written; do not discount your own ability to spread knowledge.
this just blew my mind lol
This is honestly too elite a mind
I dont want anybody to think that they would be in some kind of twilight zone when traveling close to c. To you, your watch is ticking normally, to an observer, your watch ticks very slow.
Paulo should wear a helmet if he's gonna go that fast...
I have a practically overwhelming amount of memories of this ORIGINAL version of COSMOS.
Nothing but respect though for the Neil DeGrasse Tyson version.😎👍🏻
That bit about light receeding is very interesting - I kind of knew about the other parts, but not about that.
We all will eventually die and become space dust again, this is a certainty
Italians sure know how to make a bike
Thank you. I'm a Christian who agrees with you 100%.
Fantastic video....Watch it!!
We are traveling at speed.
Sitting here I am moving at the speed of the earth's rotation. And the speed of the earth's orbit around the sun. And the speed of the solar system around the galaxy center. And the speed of the expanding universe.
Speed is relative to the observer. Where's the observer?
That’s why you don’t travell at the speed of light. You made your own brother in to an old man . .
The “brother” lived out his time in normal fashion on Earth. The one traveling near light speed in essence went “fast forward” through time.
The while thing about time dilation, how do we know we age slower rather than just perceive time slower? Could it be that we start aging before our very eyes if we were in front of a mirror, rather than staying young despite our surroundings progressing through time?
If you were to travel at exactly light speed, time actually *would* stop for you. Getting to the speed of light, however, would require more energy than exists in the universe.
@BlockisticStudios It meant that you experience time at a slower rate than an observer as you travel closer to the speed of light.
Carl Sagan explains such complicated theories in such simple ways that people with almost no knowledge of physics and cosmology can easily understand what he is trying to explain.
How did his brother survive all that time on the bench? What did he eat? Where did he poop? I hope the new version of Cosmos answers these loose threads.
Obviously, younger brother Vincenzo did not stay on the bench for fifty years. While Paulo took his relativistic ride, Vincenzo went on with his life, but returned to the bench at the same time every day, waiting for Paulo to return. The time dilation effects of special relativity led to a poignant reunion.
Don't buy oil of olay to prevent ageing. Just travel at the speed of light for half hour!!
Seriously though, what a magnificent video. This boggles my mind and makes no sense but it's all true which is a mindfeck.
Where can I get hold of the complete series of the cosmos by Carl Sagan ?
Amazon...?
If Paolo's Scooter got 60 miles per gallon, and he traveled the Speed of Light for just 10 minutes he would need a fuel tank that held about 2 quadrillion gallons of gas!
What a great video. Mind expanding to think that Time does pass at such different rates and some brilliant minds discovered this with just pencil and paper (or chalk and blackboard) to do the requisite mathematics...
Just as Carl Sagan had a “magic camera”, Paulo had a “magic motorscooter”. All to perform the “thought experiment”.
@BranZyme there was a miscalculation in the test. also neutrinos are a subatomic particle of an atom.
@justinjiang, the watch doesn't slow down. An outside observer who looked at the traveller's watch would see that the watch was ticking slower than usual, while the traveller wouldn't see this slow-down. He would actually see the surrounding world a tad faster!
@opticmovies There was a PBS program, I think it was called "Einstein's Miracle Year" that explains the phenomenon very nicely.
I remember watching this as a kid. Weirded out by the ending.
No it wouldn't. 'Time' does not have one definition.
It is all relative to each individual object, and yet it is also relative to all objects at once.
Its all down to perspective.
@manwithouthat44 man i love his voice
@Galentw that's what I still cannot understand. Traveling at the speed of light to an observer would actually be considered a very slow way to travel if time for them goes by faster than for those traveling at near light speed.
Awesome! Quantum light tradectory!
We need more people like Sagan and less dirtbag politicians and middle eastern dictators. In 1000 years we will either by far more advanced then we could ever dream, or we will be consigned to dwell on our weaknesses rather then our strengths.
0:53 When she says her parents aren't home:
@justinjiang, no. according to Einsten's theories, time is stretched out for the fast-traveller. That would make his clock running late. Anything else unclear?
I've heard that the clocks onboard human-built satellites in Earth's orbit need to be readjusted continually because their shift in space-time. I also heard about a cosmonaut being in Earth's orbit for such a long time that his time had shifted a few milliseconds (comparing to ours).
to a person who is observing a ship approaching the speed of light would the ship seem as though it is slowing down as it is getting closer to light speed because time is slowing down to the ship so the observer would see this as well? Another way to put it is there is a track the ship and the people on it are travelling around this track at light speed to them the journey only takes 4 mins from point A to B but to the oberservers it takes hours so to the observers would the ships slower than..
there's agood example about this. Imagine you watch a clock; what you see is the light that goes to the clock and then to your eyes, so you see it's moving; but if you go to the speed of light wlaking away from it and watching it, you'll see the same time always, until you stop, because you're going at the same speed of the image you received when you was in front of the clock (of course in real life you wouldn't be able to see the clock because of the distance, unless is a big star size clock)
Wonderful to see this again 43 years later, I think Mr. Sagan prefaced this by saying "imagine the speed of light was 60mph" or some such thing?
"Your NOSE is just a little closer to me than your ears."
In short, light is always traveling the same speed, then again we define space and time by light so light is always going straight too, it's the universe that curves and slows down.
Sidenote for anyone interested
With the LHC now its cool, H+ going ~the speed of light, get added energy, so they, instead of going faster, expand in size.
The Italians sure make some sick mopeds
Dem retro effects. (-:
Mind=blown.
@BlockisticStudios I'm no expert but i do know that light particles are massless, maybe that has something to do with it.
With our current understanding of the world, it seems humans wouldn't survive the journey, yet this is an imaginative journey.
Still, it is assumed that we can suvive the journey and the person traveling wouldn't die of old age since time outside your scope would pass faster relative to you, but your experience within the fast speed would seem normal.
most common example is astronauts and space satellites.
Astronauts in their average career will have travelled fowards in time by 20 hours... also the time on satellites have to be constantly adjusted to match a master clock on the earth.
The time onboard a satellite creeps ahead into the future because of the speed they travel at all the time.. this is everyday stuff
QUESTION! Therefore, if we do ever travel close to the speed of light and go to a plat, let's say 1000 light years away. Did we simply age of a few years in that case? which would make it possible for use to travel long distance in once lifetime? (without the help of worm holes)
Do you get tunnel vision because the light you would ordinarily see reflected off of the objects outside of the tunnel doesn't have time to reach you?
Vincenzo: Is it my turn yet, Paulo?
If hell is where Cal Sagan is, that's where I want go
That’s insane
You'd see either a black or white TV screen, since its a recording of light waves and refections, - Not real life.
All colors would blend, to the human eye watching the TV.
No light waves would accually be distorted.
I wish I could travel back to those times, god I hate 2022
Not unless we can travel at the speed of light
@onlynameithoughtof That is a really confusing paradox: instead of traveling fast to save time, one would have to give many years to light speed to be able to travel in a destination that would feel like a short time.
Go fast, stay young.
I see what you're saying, that all speeds are relative, but it seems we don't see that effect and light does travel that fast :-)
I don't know, I am surely missing something with this relative speed thing, but I am unable to say what, except I have a feeling it has to do with the energy put into it.
@RotaryKnight Yes, but doesn't relativity posit that as your speed approaches the speed of light, your mass approaches infinity?
If you held a mirror in front of your face while you traveled at the speed of light would you be able to see your reflect? The Church of Sagan! All hail Carl! CC!
amen
Until you know what its like or have the ability to travel at that speed, you have nothing but speculation.
Figuratively speaking, if somebody was at the top of an escalator, they would age more slowly than someone at the bottom of the escalator. It wouldn't be noticeable to us, but the effect would take place.
No it wouldn't.
Just because its 12 a.m. in central time zone in America,
and its 12 p.m. in Indonesia,
does not literally mean Indonesia is 12 hours into the future.
12 a.m. here is exactly the same time as 12 p.m. there.
If you don't believe it try doing a video call with somebody in Indonesia.
Light years cover distances not time.
Which is weird, because Carl Sagan himself said that on the first episode.
So this time travelling crap is a complete contradiction.
@@shaquadradeloiserussell8659 Hmmm the documentary I saw was talking about distance from above the Earth and that the higher we get, the slower time passed. It had nothing to do with alternate time zones.
@@RobCLynch If you are somewhere in space other than here, then you are in another time zone;
DEPENDING how you're looking at it.
Two separate places will have their own time, and yet the two places are both on the same frame of time as far as the galaxy or universe sees it.
That's why there is a popular phrase in Physics: "Time is relative'.
It does not have one , nor two, definitions.
People confuse speed with time,
the same way they confuse light with the source that provides the light.
Is a light bulb the light , or is it that stuff that's shining on the walls and floor?
@@RobCLynch Also... the theory about "Time slowing down" the further one travels in space, merely because they saw a watch slowing down,
could most likely not be because time is literally slowing down,
but the immense speed and pressure is causing the watch to malfunction;
The same as it affects your heart and other organs.
That's another thing think about if planning a deep deep space travel:
CAN this vessel actually make it that far without succumbing to damage?
Does blue and red have the same wave frequency? Or a conceptual rapresentation
Is capable to possess two overlapping quantitative meanings?
Blue has shorter wavelength / higher frequency than red.
The light from receding galaxies becomes redder (red-shifted) because it is stretched out.
Every time you change direktion you will have to use power. You will have to deaccerate and use power to go back to the point of the beginning. Travelling near the speed of light - where should that power come from?
That's some special Vespa right there
the younger brother was basically Hachiko
Scooter held up well for a few trillion miles.
If time slows down for the pilot of a nearly lightspeed vehicle, will an observer clock the ship traveling slower or faster than the pilot would clock the ship traveling? And how much is the difference? And does this mean that we could travel a lightyear in less than a year from our perspective?
Each one sees the other’s clock slows down, and each one also sees the other contract in the direction of motion.
Pilot records less time travelling from point A to point B, because an observer stationary relative to those points sees the pilot’s clock run slow. But the pilot sees that it is because the points are closer together.
@@lawrencedoliveiro9104 I just realized that the pilot would perceive his or her ship as traveling faster than the speed of light. I wonder what that looks like.
@@JohnSmith-td7hd No they wouldn’t.
@@lawrencedoliveiro9104 Thanks for clearing that up.
Why does time slow down close to the speed of light? I don't get it.
@RotaryKnight Wrong. Newtonian physics state that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an outside force. If you were to suddenly accelerate to the speed of light, you would disintegrate because of this law. Your body does not want to go that fast. The acceleration of 0 to 183000 miles per second would tear you to shreds. The Force would be infinity. F = ma. If a is infinite, then you have infinite force on you.
no mate. to you, that 8 mins would be like just a few seconds or less, but in reality, its still 8 mins. your bio clock ticks slower, that means you "degrade" slower. but if you were travelling for 8 mins according to you (your bio clock), then yes, you would find your frends old.
Nice
Filming location ????????
You don't need to go that far. Since acceleration and gravity are the same thing in space-time (by Einstein's Theory of General Relativity), you can do the test with two atomic clocks at different heights. Since being closer to a gravity well distorts space-time the same way going fast does, the clock at the top of a skyscraper ticks faster than one at the bottom. This becomes a very real issue with GPS satellites, which fall behind by 7 microseconds each day, translating to 10km of inaccuracy.
what it actually is going?? Because in a way you actually arnt travelling any faster, just say you find out someone close to you is dieing and you obviously wan to reach them in the quickest way possible, so lets say you use light speed yes to you, you arrive extreemely quick but to the observer you are delayed and might even miss there passing?? This stuff interests me but is confusing, someone care to explain?
correct me if I'm wrong PLEASE. :) but wouldn't a human simply DIE if he travelled close to the speed of light? Einstein's theory of relativity states that the faster you go, the heavier you get. So let's say that you are travelling in such a speed so that your weight is 1000000 heavier (quite close to the speed of light). Thus any movement (at all) would mean huge changes of chinetic and potential energy.Would the heart be able to pump the blood around?Would an arm-stretch tear the body aparty?