What You Would SEE if You Traveled Near the SPEED of LIGHT
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- čas přidán 19. 06. 2024
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References:
How objects look near speed of light: t.ly/oaAE
ESA-Hubble redshift: t.ly/x9p9
Speed of light game: t.ly/VXe6
Chapters:
0:00 - All light is basically the same
1:44 - Our slow-mo world
2:38 - Doppler effect
4:38 - How colors distort near speed of light
8:09 - Relativistic aberration (searchlight effect)
8:58 - Surprising time and length effects near c
09:05 - Things are NOT as they appear
13:58 - What is really true?
Summary:
All the light that we see are electromagnetic waves. All different wavelengths are equivalent, except that waves of higher frequencies are more energetic. The speed of all these EM waves, however, is the same. It's the maximum speed allowed in the universe.
This speed limit sets the max rate at which information can flow in the universe. This assures that causation is preserved. Einstein showed that the world would look very different as you near this speed. We don’t see this because our terrestrial speeds are very low compared to the speed of light.
What would happen if we traveled closer to the speed of light? Strange things.
When an ambulance approaches you, the wavefront made by its siren gets packed together towards the direction of movement. This causes a higher pitched sound. Similarly, the wavefronts get further apart in the opposite direction. This results in a lower frequency sound. This is the doppler effect.
Something similar happens with light. As seen from earth, most galaxies are redshifted, thus the wavelength is stretched. The galaxies are moving away from us. This is called the relativistic doppler effect, and it happens thanks to relativity. If we built a fast spaceship that traveled near the speed of light, this effect will change how you see the world compared to person who is not moving!
A red traffic light at 25% the speed of light we would be seen as green. If we moved away from the red light at 25% the speed of light, we wouldn't see it at all because it would be infrared, something our eyes can't see.
This also means that infrared light that we currently can't see in the cosmos would become visible in the front window of our spaceship.
Likewise, natural high energy ultraviolet light which is also invisible to us now, would become visible from our rear window. So we might see unexpected objects and colors both in front and in back our spaceship.
Another effect would be on the side window of the spaceship, called relativistic aberration, or the searchlight effect. From the side, you would not only see the colors distorted, but the light would appear brighter towards the direction of motion, and darker away from the direction of motion. This is because, if you are going very fast forward, then you are racing into more photons.
Special relativity also shows that time and length are also different for a moving observer, compared to a stationary one. At 60% the speed of light, time will slow down compared to a stationary observer, but you will not experience anything different. From your frame of reference, time will tick just like it does on earth.
1 meter for a stationary observer would only be 80 centimeters for the moving observer. This is called length contraction. This SHOULD mean that objects would look squished together. This is what’s happening, but NOT what you will see. Instead, you see objects curving away from you, and rotating towards you. The reason is because the photons from the front of the building are reaching your eyes earlier than the photons in the back of the building, so you see it curved. This is an optical illusion. the object in fact contracted.
This same effect means that spherical objects like earth don’t appear squished like a pancake, even though they are contracted, but remain spherical-looking. But they will appear rotated towards you.
This is again an optical illusion, because in reality the object is contracted. What you will experience is that distances are reduced, so a trip to Proxima Centauri, 4.5 light years away, will only be 3.6 light years.
The interesting thing is that even though things would be closer to you, they would actually look farther away when you viewed them from your front window. Likewise looking out the back window things will appear to be a lot closer.
#speedoflight
#specialrelativity
This seems to be a paradox, but as the spaceship moves faster, length contraction in the direction of motion means that objects on the side of the ship move towards the front. In fact, all the light from the side and even behind the ship would shift forward.
Your field of view increases in the direction of movement and decreases behind the spacecraft. Looking forward in the spacecraft would be like looking through a fisheye lens and looking out in the back would be like looking into a zoom lens. - Věda a technologie
There's a game called "A Slower Speed of Light" that simulates relativistic doppler shift, lorentz aberration, and length contraction. The speed of light is set to a brisk jog, allowing the player to explore a human-scale environment at light speed. It's a bit of a trip, but it might help to build an intuitive understanding of relativistic effects. Or, sign up for Brilliant :)
And there is a nice video in YT explaining what you see in the game, and why,
You Won't Believe How Weird Approaching The Speed Of Light Can Get | Doppler Effect & Time Dilation
also this
A Slower Speed of Light - MIT Game Lab Relativity Engine
Just downloaded and played it. Finished in 7:01 which is very slow I think. I wanted to like it but honestly I think it is just going to look like glitches to most gamers.
Looks amazing,.going to play it.. thanks
As per usual, I knew about 80% of what was covered in this video from explanations I read for decades...
... but also as per usual, they were never explained so perfectly as when Arvin Ash does it in his videos !
Arvin has become one of the greatest popular science educators in my lifetime !
Wow, I'm humbled. Thanks so much!
@@ArvinAsh Okay. If we are already hurdling through space at (what speed?) doesn't that bring us closer to attaining speed of light if we make up that difference? Instead of from a dead zero speed say from the center of the universe (calculate dead 0 speed)..I'm not messing with ya. sorry if it sounds that way.
@@healthy2202
A bit late, but just reading it now 😁
You have to remember that speed is relative. There is no absolute stand-still. So you have to think about: speed compared to what?
The fact that we can calculate how it would look when travelling closer to speed of light and use that info to create exact images using CGI is so cool and exciting. Great video. The amount of effort gone into making this video is appreciated.
While I don't disagree with you, I want to point out that we really don't know what it would look like. This could be very accurate (and most likely is) but it could also be very wrong its only speculation at this point. Very cool none the less. I am just one of those party pooping types I guess lol
@@78kasper78 Yeah, this is true. Relativity, while correct for most situations we can observe, completely breaks down in extreme conditions like at the event horizon of a black hole. This doesn't mean relativity is wrong, it just means it's incomplete and cannot describe that situation. For everyday situations with no high speeds or large masses involved, relativity will actually reduce to Newton's laws (by just making certain assumptions). Relativity will eventually be superceded by something else like M-Theory (which will reduce to relativity given certain assumptions). Relativity still makes my brain hurt though.
@@78kasper78 w
There is a fantastic game the MIT lab made and released open source called A Slower Speed of Light. Because you really can't model what looking that fast would be like reasonably, it instead slows light down to show both the color shift as well as the 'latency' and looking forward but in the past.
Moving faster than all blue light is a very strange idea. Realizing the issue isn't going that fast but rather hitting slower things at that speed (tachyons) can reframe why moving so fast can be bad no matter what way you look at it, but I think messing around with the game can put the general theory into.
The demonstrated doppler effect with colors is incredibly beautiful. One could imagine how it might be perceived if our eyes had more concepts for a wider range of radiations.
Yes, I have a link to it in the description.
@@ArvinAsh Oh oopsie hehe
I just thought of it immediately
My brain starts to go mush as soon as I consider two different reference frames
thanks for the video :D
Saw video on similar topic on very popular channel but barely understand anything. Your explanation is very simple, even a kid can understand. Keep going!
Arvin,
I commend your elucidation in this video. I haven't watched any video as clear as you did explain. You answered my curiosity on how I would see the surrounding while traveling at light speed. Thanks a lot. You are awesome and gifted.
Fantastic video, Arvin. You're the best. The time spent on this video's production is greatly appreciate.
Another well-done video. Thanks for putting out such high-quality videos.
Thank you for the easy-to-understand video and explanation😃
I felt like traveling in space in 2022🛸👽
good news. you have already succeeded. we are already traveling in space.
@@healthy2202 Yes but with Earth
@@rajveerkanojiya2985 YOu still have to admit.. Its one hell of a ride. but we really need to be more careful for what we have left to work with.
Fantastic video as always, thanks for those incredible explanations Ash.
This was such a great question to answer.. Perspective on objective reality made me think about our mere existence again.. Thank you..
Thank you Arvin. I always wait eagerly for your awesome videos. Your and PBS spacetime are outstanding channels.
Thank you Mister Ash. Happy New Year. I always wait eagerly for your new videos as all those are so fantastic and so educational and easily accessible for amateurs who do not work in the field of astronomy or physics. Thank you for your great videos !!
One of the best physics video's I've seen in a long time. Well done, Arvin.
Had to put the bell on for your videos because they always so so enjoyable.
The frame at 3:50 Just Blew My mind
After many Years I finally understood what's redshifting of light
Thanks Man You Really Explained A Complex Question Simply with A Picture
Arvin, so are you telling me that taking one hit of LSD is equivalent to traveling near the speed of light? 9:52 Ahahah, just kidding! Love your channel!
This was pretty mind-melting man I loved it
A really interesting episode. Hats off Arvin!
As everyone pointed out you explained it very well and every phenomenon. I just subscribed to you. Keep up the good work.
You're so brillant Arvin respect! Each video is an amazing adventure, simply your ton of voice make us feel like you're saying obvious and easy things in spite of you're talking about complex stuff... That's the real talent, your talent, you're brillant. Thank you so much i can't get enough of your videos Arvin! Happy new year and lot of success, all you deserve
Wow, thank you so much. Much appreciated.
As per usual, I knew about 80% of what was covered in this video from explanations I read for decades...
... but also as per usual, they were never explained so perfectly as when Arvin Ash does it in his videos !
Arvin has become one of the greatest popular science educators in my lifetime !
@@ArvinAsh Yes , I agree with that . "Everything is relative". It is somehow disturbing . It creates a strange kind of fear in the human mind. But great video as always. 👍
Brilliantly explained. I'm also pleased to have confirmation that I got things pretty much right in a short story I wrote about someone travelling at almost light speed :)
Sounds like that was fun to write.
A short story to you maybe, but an epic novel to the person travelling at near light speed.
Almost?
@@PetraKann The word is applicable in the story context. Basically they are trapped in a ship that has power and is accelerating indefinitely (for billions of years, at least) but perceiving time at a very rapid rate. Hard to explain it all here but it involves uploading a mind into a machine...
@@macronencer Interesting. I like Sci-Fi. I have been working on a Sci-Fi story - more along the lines of a novel though.
It's a little cryptic as far as the plot and main themes are concerned so there is a lot of input and interpretation needed from the reader.
Not much is given away in the story apart from character interactions. In fact it's not clear where and when on the time-line the narrative is set.
Transferring a mind into a mechanistic framework is problematic. Some time ago I read a book on the Physics of Large numbers and the author revealed the largest number that he knew of which could be directly coupled to something physical in the Universe.
He mentioned numbers such as the total number of atoms in the observable Universe which is maybe around 10^80.
He moved higher and higher until he got to the largest physical number and that was the number of different neural combinations in the Human Brain. The estimate is based upon a cluster of neurons of specific size (10 or 100 from memory).
The estimate for the total number of different neural connection combinations was 10^700,000,000,000,000 (ie 10 raised to the 700 tirllion).
So unless you truncate or drastically reduce the capacity and power of the Human Brain, it would not be able to be uploaded into a device that is mechanistic and non-biological in nature. There simply arent enough atoms in the Universe to make such a device.
What was the nature of the computer in your story? A quantum computer?
When an explosion is big enough, dust becomes sentient and starts making CZcams videos.
Very good explanation Arvin. Thanks for this video.
Another question about light and expansion of space. When we see deep space, we are seeing the "distant past", the stuff that happened in our light cone. So when we "measure the expansion of space" and see acceleration, does it not mean that we are confirming that earlier inflationary period? I mean visually, we are not seeing that space is now expanding in all directions, we are seeing that it was expanding in the past. Anything happening "now" at a great distance away is not in our light cone, so there is no equivalent of the Hubble constant for present states of the distant universe. Those events are not in our light cone...???
It's impossible to gain any current information on places far away because information can't travel faster than light.
@@Birrrrra so maybe the future is a non-trivial solution to the zeta function. We can only see what will happen next by analytic continuation of the past coming into contact with the bowshock of the unseen deterministic equations of relativity (lorentz transform). Ie, just because physics is deterministic does not mean it is predictable or uh unsurprising. Scary lol
@@haniamritdas4725 I'll be honest you lost me but it sounds neat!
@@Birrrrra haha well everyone is lost at the zeta function actually! The existence of any those solutions was predicted by Riemann to lie on the line x=1/2. If you can disprove that (by knowing all solutions somehow and one of them not being on the line) then you will win one million dollars. Yeah baby yeah (I mean if I understand the rules heh) anyways the function makes some cool pictures and there is a lot of content online about this famous problem if you are interested
lol, I love it, just posted on your last video like a day ago asking when the next video was coming out, and here it is lol
you made him post this!!!! :D
@@UnchartedWorlds this video was amazing fyi, I already knew about time dilation and light shifting, but the length contraction thing. That must have gone over my head all these years... I'm still processing it... so not only are you getting somewhere faster, but the distance getting there is less. but time dilation kicks in if object has mass and really throws me off now... I'm gonna have to watch the equations part of this video a few times and really process that. because from what I know of time dilation, travelling close to the speed of light send you to the future, even though from your perspective as the traveler you are getting there quicker and shorter now with length contraction. That's wacky... like I said, I gotta think about this for a bit...the length contraction thing is really mind blowing... And it's not a perspective thing... the length is actually different?! also thinking about how we should have mini telescopes in orbit around the sun going at fractions of c so we can view different spectrums of light...
I told you I read and respond to all my viewers! ha.
@@ArvinAsh I know you do :) i love it
@@ArvinAsh when you described the Doppler effect of light, seeing things behind you in the front window, I thought of the Analogy of driving in the rain. The faster you go, the more the rain appears to be going sideways, directly into the windshield. Even if it’s actually blowing in the opposite direction. If the rain were blowing sideways at 60mph, like in a hurricane, and you are driving in that same direction, the rain will appear to be falling straight down as you drive 60mph, and appear to be coming at you as you go even faster. Just like the photons leaving an object behind you, you are running into those photons that left the object at a previous time, those photons are moving away from the object behind you, but you are catching up to them as they hit the windshield (front window?) of your spaceship.
Love it! This was an exceptional video!
I would love to see a demo of these visual effects of traveling near light speed in virtual reality. Seems like a perfect medium for showing something like this to envision what it would actually “feel” like given VR’s immersive qualities.
Impressive up to date, well explained video.
It must be said: Arvin is just *_ridiculously_* good at this.
Many thanks!
Been falling asleep to these videos for months now, always makes me think about what we can do. Appreciate this man👌
Good video thanks. Delving a little bit into philosophy there at the end. 😁👍
Issac arthur also explained like this video has by saying it the speed at which information can travel but we call it speed of light. Love how u make this topic easy for anyone to understand.
Infrared and ultraviolet light would become visible.. this was nice to realise ☺️☺️
You make some willlld cool videos, especially for a layman like me!!! Thank you so much!!! I’m an anthro/history/behavioral studies student and here I am feeling like I’m in a Dr. Who episode!!! Love your videos Arvin!!!! It’s wonderful how you break it down so even I can wrap my mind around it!
As per usual, I knew about 80% of what was covered in this video from explanations I read for decades...
... but also as per usual, they were never explained so perfectly as when Arvin Ash does it in his videos !
Arvin has become one of the greatest popular science educators in my lifetime !
Which is the best University for history/ anthropology/ languages in the US ? Or the best 3-4 ones. My 15 year old son is deeply interested in history and he is really good at it. Knows more than his teachers , usually.
Excellent video, thank you Arvin, I really like your channel.
What a fascinating video. Good work.
THIS MAN HAS REMARKABLE, FLAWLESS AND UNDEFEATABLE STRENGTH AND WAY OF EXPLANATION IS JUST 🙌🙌.
THANKS ARVIN SIR FOR SUCH AMAZING VIDEOS 👍🏿👍🏿👍🏿
Imagine going 20% the speed of light and having to stop for a traffic light
But ahh, it's a very BUSY strip of space! lol.
am blessed to have finally found this youtube dimension...absolutely stunning
I’m just a regular guy that loves sci-fi movies and novels. However, your content has quickly become part of my regular “entertainment” diet.
Almost every video you make causes me to gasp or audibly exclaim ,”holy cow!” You help me understand the wonders of scientific discovery and the amazing nature of our universe.
Thanks for what you do! I will continue to share, subscribe and support your channel!
This is something ive always wondered in sci fi. Wouldnt a lot of light just turn into gamma rays and kill us in relativistic speeds?
Depends on your speed, but potentially, yes, unless the ship was shielded somehow.
That's where "Deflectors" comes in. Dust, Gamma and Ionizing Radiation
Another lesson her should be hanging a warning sign on the front window like they do for rearview mirrors, "warning stars are closer to you than they appear when you're near light speed"
Fascinating! Thank you
When I saw the topic yesterday, I mainly thought in terms of time dilation. Your talk has opened up a whole new possibility on the basis of Doppler effect. I suppose one needs a fertile imagination too for understanding relativity.
Cairo dindori
Hi Gururaj 👋 I hope my comment didn't sound as a form of privacy invasion your comment tells of a wonderful woman with a beautiful heart which led me to comment I don't normally write in the comment section but I think you deserve this complement. If you don’t mind can we be friends? Thanks God bless you….
I love how towards the end he says objectively that there is no objective reality.
Brilliant description!
Fascinating, thank you!
Arvin, another great video, explaining a mind bending question. I enjoyed it very much. You have not lost your touch. As usual, the graphics are right up there, helping us more clearly understand your proposal. Thank you.
Hi Captain Peter 👋 I hope my comment didn't sound as a form of privacy invasion your comment tells of a wonderful woman with a beautiful heart which led me to comment I don't normally write in the comment section but I think you deserve this complement. If you don’t mind can we be friends? Thanks God bless you….
Well done and easier to follow than anything else I have seen on the subject! thanks
Hi Glenn 👋 I hope my comment didn't sound as a form of privacy invasion your comment tells of a wonderful woman with a beautiful heart which led me to comment I don't normally write in the comment section but I think you deserve this complement. If you don’t mind can we be friends? Thanks God bless you….
Script; animation; video editing and narration are extraordinary as always. Each and every words and sentences have lots of facts and that’s the reason many a times I watch video several time.
Some of my understanding about traveling at the speed of light, not sure those are correct: 1) distance becomes irrelevant since we can reach any part of the universe in no time. 2) Traveller will have no reference and preference when & where to stop. 3) Travel/journey will look like a teleportation.
Amazing video. Thank you.
Awesome video Arvin, as usual! 👏👏👏👏
8:45, how could you get more photons in the direction of motion and less opposite to the direction of motion? Einstein's SR states that the speed of light remains constant so basically if one would travel at speed of light, a photons leaving our spaceship will still travel at speed of light and on the opposite, a photons travellng towards the spaceship will also travel at the speed of light 🤔
I wondered the same thing. Of course I concede I don’t have more than a rudimentary understanding of Light and its properties.
Good question! Light intensity is determined, not by the speed, but by the number of photons hitting your eyes. As you race forward, the number of photons entering your eyes is higher because you are racing towards them. The opposite happens behind you as you race away from them.
@@ArvinAsh I got the intensity of light coming from the number of photons entering the eyes. But to me, it remains the same amont whether we race forward vs racing opposite to them since they are still travelling at speed of light relative to us and thus the amount of photons should remain the same hence no difference of light intensity in my humble opinion but I m not astrophysicist 😁
However, the explanation could be that because you start to perceive objects at 90° or even behind you in your field of view, the amount of photons is way higher in front of you than behind you and thus a higher light intensity looking forward than backward. Does it make sense?
I really appreciate the time you took to answer, I was not even expecting you to answer given the amount of comments you re havng on your channel! Congrats again for your videos, I really love them.
Greetings from Belgium.
photon number is a relativistic invariant, but solid angle is not.
Hey buddy i think you miss something important in QM I=nE/At in other words the intensity of light equal to many photons multiplied by photon energy(Joule)divided by surface area( M^2) multiplied by time(Second) meaning that the I inversely proportional to time since I=n implied that that if you moving at light direction the total of light hitting to your
all body would be higher than the oppposite since your distance towards the light is closer compare to opposite direction
I love Arvin's explanation, Thank You Arvin that even dullards like me can understand complex concepts. Edit : btw is it me or anyone else noticed u kinda change your intro music ?
No friend, you are not stupid
@@elam812 I Love you bro
@@VinnieBlackLodge hehe Yes
@@extraordinarygamer937
Thank you
شكرا لك
@@elam812 welcome man 😀😀
Simple and brilliant explanation
It would be interesting if you explain how it may look traveling at warp space since space should be shrunk in front and expanded behind but in relative sense the velocity of the craft moving within the warp bubble should be slower than the speed of light so the effect should also be warped.
Exemplary scientific and innovative and fusion of Doppler's effects and lights behavior is amazing in present context and in DIMENSIONS of science as well. Thanks
Amazing so much I have learned through the years. From all of these great shows. And now as James Webb approaching it's final orbit,i can hardly wait for what new things we will learn when new data arrives. Amazing how clever we are, but somehow it certainly looks like our brain is wired wrong. I wonder why we struggle with all kinds of issues, because we should be able to solve these issues. Cooperation seems to be the keyword ,? Maybe a show about solutions. I think science is the best way, solving our current issues. But what do science suggest? Happy new year
Indeed. The cosmic masters have said we need to start to adopt co-operation and abandon competition.
I dunno. No one improves without adapting to adverse conditions. But all adversaries are not enemies, are they.
@@haniamritdas4725 sir, what's your real name ?
Something like game theory is the closest we have to objective ethics iirc.
I couldn't agree more. Unfortunately this is hard to happen if we keep our heads in the mud, watch reality shows more than we watch and learn science, insist on difference in color, race, ethnicity and religion, more than we see the human side of our own brothers all over the planet. Science is a huge cooperative tool but can also be misused by politics and greedy people
Very fascinating!!
Fantastic video!
Excellent video. I’ve always wondered this.
The next question is what would things look like on a ship like the Enterprise traveling faster than light?
Pure black
Well, presumably they would be in a warp bubble, so inside their bubble they would not experience any time dilation or length contraction effects because they would not be moving relative to the space inside the bubble. Regarding what they would see "outside" this bubble, I am not sure. They may not see anything because the space in the warp bubble would be isolated from the outside.
@@ArvinAsh If a warp bubble is isolated from the outside, doesn't that imply that space outside the bubble wouldn't be affected by the bubble as it passes through the universe? Effectively meaning you wouldn't need to steer or otherwise avoid any inconvenient matter you might encounter. And doesn't that also suggest that the universe could be full of warp ships flitting around all over the shop, but we'll just never be able to see them? Which then begs the question: Could we detect such bubbles in a similar fashion to how we detect gravitational waves if one happened to pass through the detector?
@@-_James_- outside space most definitely will be affected by passing by bubble, just not by what happens in space inside this bubble. Same way as from outside perspective region beyond event horizon of a black hole is causally isolated, nevertheless "outside" is very much affected by near event horizon bubble-like surface which keeps information, causal connection and all important properties like mass, spin, velocity etc.
After watching this vid I thought of a wish. Your vids often lead me into these contemplations.
Unfortunately the wish would break causality. The wish would be to see the universe from earth and our telescopes etc as it is now. Discounting objects that have naturally disappeared over the light horizon, the far, near and middle distant objects as they are now in their proper positions. So taking one example an object say 250 million light years away adjusted for its current position and any changes stellar births deaths everything up the the present. This would go for the entire visible universe.
Of course it is impossible but I wonder what it would look like?
The wish that breaks a universe. No Genie can comply LOL.
I recall a video made, maybe by NASA, which showed what the night sky would look like millions or years in the future. This is equivalent to your wish to see the "current" state of the universe. Do a Google search - it's on the internet somewhere. I just don't recall what website had it.
@@ArvinAsh Thank you for everything you do arvin, you along with many other people who give information like this are fucking amazing. There is no gift greater than knowledge and information, especially knowledge and information that is complex yet made easy to understand by people like you.
.
Isn't this what the James Webb telescope will be doing? It will look into the past by observing light that is very far away. According to NASA, the James Webb Space Telescope will focus on four main areas: first light in the universe, assembly of galaxies in the early universe, birth of stars and protoplanetary systems, and planets (including the origins of life.)
@@escobyte It's not in real time.
Webb is looking back in time.
For example Andromeda galaxy. Our galaxy the Milky Way and Andromeda are in a binary orbit around a point of gravity in space. The light - the stars and gas etc we see from Andromeda is 2ish million years old. I want to know what Andromeda looks like now, not how it was 2 million years ago.
We're colliding with Andromeda and one day there will be Milkdromeda or Androway LOL, but 2 million years isn't much time in the scheme of things really, what about those objects out there that we routinely see that the light left hundreds of millions of years before the dinosaurs went extinct? Where are those galaxies now? What do they look like today? How have they evolved? What of the motion and arrangement of the stars within them?
How has the galactic web changed? Are all the quasars gone? How many galaxies we see today have actually gone over the light horizon?
That sort of thing. Due to the speed of light we can only look back in time we can't see the universe as it is NOW!
I want to see it now (provided it hasn't been eaten up by some theorized under the standard model process - then I'd rather not know :)
Excellent visually aided explanation
Thanks, this was a unique into vid. VEry interesting.
This was fascinating and very well explained, thank you.
Arvin Sahib, another excellent video, thank you. Did you ever make a video on how a photon experiences time? I would love to know that if a photon doesn’t experience time then how does it travel through space and reach us in a certain number of light years?
If I were a science teacher, I would put my feet on the desk, maybe an eyemask, some earbuds with brown noise, and stream this video.
Great video!
Excellent presentation!!!!
It's kind of spooky that the faster you go, visual and ultraviolet light will become X-rays and gamma-rays. They'll have to deal with that.
"Everything is relative", I said to my teacher in history of science. He (who was also a phycisist) corrected me: "Everything is relative -- except the speed of light!" And of course he was right, C is a universal constant. But now I wonder: Would there be any relativistic effects at all, if even the speed of light was relative? And if _nothing_ was relative, how should that universe looks like?
@ArvinAsh
8:58 this part needs more attention and improvement so that I ,a 9th grade student , can understand it more easily and intuitively.
Thanks Arvin Ash for such a wonderful video. I understood 95% of the information but faild to understand this part 8:58 ( 60% understood).
Thank you ♥️❤️
This was a great presentation. I've seen another good one. Computer graphics make teaching "easier".
Complicated ideas with simple explanations. Nice
Great work explaining this. Not an easy task.
I love your philosphical discussion
I find this so fascinating
Nice to see a new vid. Thanks for sharing! If you could experience time as a photon you would see its origin and termination all at once as no time passes for these waves. Maybe a bright light would be seen? Light going in a blackhole maybe black (not present), then dim then, red (as it would be shifted red), then slightly brighter light as you got close to singularity?
Not sure that a photon has a perspective, but theoretically, time would stop, and the entire universe would be a single point, so a photon from its "perspective" is not moving. The entire universe is already at its location.
@@ArvinAsh I mean if you could be a photon and give yourself time (just enough to enable you to see your whole life experience) its all quite fantastical but very interesting to think about.
Can you do hawking points next and their implications for cyclic universes vs other significance? Thanks for the great educational vids my friend :) Hope you are well.
@@ArvinAsh curious if I understand correctly but at the speed of a photon 'c' everything would exist at a singular point in space relative the photon?
If this is correct, then is all mass actually expanding the amount of spatial compression around itself in "some" relation to 'c'? (don't know exact formula)
So is then general relativity just a statistical model of the warping of space time due to time scaling effectively just mean time-dilation differential is gravity?
This definition of gravity poses no conflict between quantum field theory and general relativity.
Just a thought. 🤔
Edit: To give context to what I wrote above, it is probably easier to think of time-scaling like an atmospheric pressure of space time. Personally I call it causality-factor to give it a name.
It helps looking at it from this viewpoint that gravity is differing space-time pressure similar to bubbles in a body of water. Where water is the vacuum of space and everything that exists has its own bubble. The density of air inside each bubble is the time-scaling differential or causality factor.
Edit Edit:
In this way a bubble's density as an expression of its gravity would be less dense the closer to 'c'. The less dense draws in the more dense similar to gravity.
c = Square root of ( e / m )
Or
Causality factor = Sq root of energy density.
The moon is a perfect example given it has far less gravity than the earth yet its mass to gravity is not equal in comparison.
Mass to earth about 1/81
While g to earth is about 1/6
Considering the moon has more kinetic energy given its orbiting the sun the same as earth while also orbiting earth, the gained difference in g of the moon can be attributed to the additional energy.
I made a comment on the pre-release video. 1 safety issue overlooked is that normal visible light can also become dangerous ionising radiation by turning into UV-C, X-Ray, Gamma Ray by the doppler effect if the spacecraft is traveling fast enough towards a light source.
Correct.
Travelling close to the speed of light sounds like a hell of a trip!
I’ve been thinking about this exact question for years asking people about it and only getting partial answers and sometimes no answers and little explanation. But now I got it. Sort of! Great job explaining this.
I have one more part, I would like to “feel”. Not great with the math.
If we did the identical same experiment, but now say moving away from earth but having a super great telescope constantly focused on earth, what would it look like moving away from earth? Ok, folks on earth from our perspective would appear to be moving slower and slower as we approached the speed of light. As we then slow down, I would assume folks on earth and the planets rotation around the sun would appear to move at the same speed as objects not in motion relative to each other and as we turn around and point the space ship facing earth and begin to accelerate, I think earth would appear to revolve around the sun faster and faster. As we slowed down to land back in earth again rotation of earth around the sun would appear to be back to normal as we got close to land on earth.
But, I also know that for earthlings maybe 50 years went by and for me, maybe only 1 year went by.
I’d love to see an animation of that with clocks on earth and spaceship and a “differential” to see how it all works and “feels”.
These animation can teach the world the beauty of our universe and this video you did today blows my mind. Its great.
Just a small request, if you too find it interesting to tackle the proposition proposed with the telescope constantly at earth and time differences I’d bet of folks would love that.
It would be fun to zoom around the universe in a game that had all effects built in including clocks on earth and spaceship and views out the front, side and rear windows.
Anyways, I am much closer to at least understanding this than I was before your video.
Thank you very much.
Stefan
Thank you for your great videos, you're the best teacher ever
Carl Sagan, Stephen Hawking, Neil Degrasse-Tyson... Arvin Ash ?
... ABSOLUTELY !
Outstanding 👏👏👏
THANK YOU DR.ARVIN ASH...!!!
Love this channel
I wish this guy was on the table when writing screenplays for sci fi flicks. Producers and directors need him on the set. I would say maybe take some acting classes but by what I see and hear here he would nail it on the first take to get audience up to speed. but he would have to sell faster than the speed of light to sell the script. I don't think he can because that would be bending the rules. Maybe that is why 99.9% of us go faster than the speed limit. I love this guy. I admit I had to watch it a few times to catch most of it. I'll do it again to keep up to speed. lol.
Fascinating.
Great video
Oh i didn't know you use to spacetravel with Keanu Reeves, what a beatiful crew!
I am so worried now 🤔travelling at light speed doesn't sound fun anymore and we might jump the traffic signal too. Avoiding collision is another worry.
Look like?
What a nifty formula for determining the colour of the light when you’re moving or when you’re stationary.
10:30 their silhoutte is circular but they look far from spherical if you can see depth or 3D. I have some videos about this. Penrose also pointed this out in his 1959 paper on the appearance of spherical objects (hope i recall the year right)
Arvin Ash pure brilliance!
Just gotta say the animations are out of this world.
Eye opener, indeed.
Mind-blowing concepts are being easily understandable through your easy explanation. Love to hear from you about other things as well. Thank you so much for this easy explanation.
great vid! On a different note: when people hear that the center of our galaxy is ~ 26 000 light years away from us they think (it included me) it is not possible to get there in the span of a human life. I was shocked to hear that constant 1G acceleration travel gets you there in 50 years. The only problem: meanwhile, from the point of view of earth more than 100 000 years have passed. It could be great to have a vid about that. keep up the good work
ref: "Space travel under constant acceleration", wikipedia
Well, constant 1G acceleration would stop once your speed reached close to the speed of light, so yes, it would still take over 26,000 years. One caveat is, however, that depending on your speed, time dilation may allow you to reach that destination within your lifetime. On earth however, 26,000 years would have elapsed.
@Arvin Ash will you please make a video on length contraction?
How can you not love these videos?
Another brilliant episode no matter how you look at it. Thank you, Ash. Would how the universe appears at relativistic speeds through cameras? Any difference between the human eye and a mechanical one? Would it still record the distortion of space time? Would a black hole appear different as we skimmed the event horizon while at that speed?
No difference, as these effects are objective reality, not subjective interpretation from our brain. The change of angle and frequency of the light would happen regardeless of who or what is observing it.
Camera would record the same with one caveat. What we would be seeing, while an optical illusion in the way that it really appears, this is not due to inaccurate interpretation by the brain. It really does present that way. Only things light, our perception of colors are interpreted by the brain. A camera could record for example infrared or ultraviolet light that our brain could not see.
Very Very Good Work 👍