GPS Satelllites Are Time Traveling Right Now!

[@bw8582]

Scott Kelly, the astronaut, is actually younger than his twin, not older. time doesn't speed up for astronauts... it slows down. that faster you travel, the more time slows

[@stephenconnolly3572]

Thank you! The whole video I was thinking..."I think you got this backward man"

[@JonathanDaniel1986]

You are absolutely correct Brian.

[@vadimev]

You missed the gravity part, most people do. The faster you travel the more time slows for you, however also the closer you are to a gravity source the more time slows for you. For astronauts the gravity part wins out over the speed part (they are actually not traveling all that fast, relatively speaking), so being further away from a gravity source time speeds up for them.

[@vadimev]

Well, to be honest, I was thinking more about the GPS satellites, which are much higher up than the ISS. I don't wanna do math now, maybe astronauts do age slower...

[@stephenconnolly3572]

Vadim Evstifeev Really good point, I hadn't thought of that. So I looked it up and this is part of what Wikipedia has to say... "Gravitational time dilation is at play e.g. for ISS astronauts. With respect to ground observers the ISS astronauts's relative velocity slows down their time, whereas the reduced gravitational influence at their location speeds it up. The two opposing effects are not equally strong. At the ISS altitude the net effect is a slowing down of clocks, whereas in much higher orbits clocks run faster than on the ground" So yea..depends on the orbital distance.

[@TheCharleseye]

I'm moving my bedroom down to the first floor so I can spend an extra nanosecond in bed every night..

[@JonathanDaniel1986]

You're going to want to stay upstairs. Higher relative velocity = slower your time experienced. They got this backwards in the video

[@TorquemadaTwist]

Thanx. When he said that I kept thinking 'How was it that everything I'd read on this was wrong?'

[@pancho10silva]

Yup i think they have that part grong, I see this that can help to get it better. www.einstein-online.info/spotlights/Twins

[@vadimev]

+Jonathan Daniel Except moving your bed upstairs or downstairs has to do with being closer or farther away from a gravity source and has nothing to do with velocity. Although you're right, being farther away from Earth will make you experience time faster, so you would have more time to spend in bed.

[@TorquemadaTwist]

Vadim Evstifeev So the next time I'm laying around in bed I'll just say I'm time traveling.

[@thattassiewargamer]

I remember watching this video for the first time back in 2016 and it changed my world. I've watched it at least once every year since then for the last 73 years. Keep up the good work.

[@saltygrasshopper]

Did the time traveling cellphone lady teleport a network of cellular towers with her as well?

[@bunny7443]

maybe she did actually

[@TorquemadaTwist]

Good point.

[@chainsrad6354]

In the future they use dimensional wifi, were you not listening to the man talk.

[@Yoopsen213]

Oh wow

[@LemonChieff]

Honestly this isn't this cool at all. If she had an iPhone than that would have been impressive. She would have been able to send a picture to twitter in black and white as a proof! Kappa

[@bi1iruben]

4:00 no not 15nanoseconds a day. Special Relativity causes the faster moving satellites to fall behind clocks on the ground by about 7 microseconds a day. Whereas General Relatively makes the clocks on the satellites seem from observers on the ground to be ticking faster by 45 microseconds a day. The combined effect is +45 - 7 = 38 microseconds a day - you were off by over a thousand fold. This would result in a miscalculation of the position of a GPS receiver of 38 microseconds x Speed light = 38x10^-6 * 3x10^8 = 11400 metres a day ! A GPS signal would take just 75 seconds to drift by 10 meters (10metres * 24x60x60 seconds / daily drift of 11400metres). see physics.stackexchange.com/questions/1061/why-does-gps-depend-on-relativity

[@superveganwhat]

at 4:45 in he said the astronaut going at 14,000 miles and our would age faster relative to somebody on the Earth was going slower shouldn't it be the other way around? or dose the Earth's gravity have more of an effect on time dilation then going 14000 miles an hour relative to the person on the Earth? the Teaching Company has a 12 lecture DVD with Professor Richard Wolfson that makes time dilation very easy to understand

[@DavidWMiller]

Depends how high the orbit (higher orbit = slower speed). At an orbital height of 1/2 the planet's radius, the effects cancel each-other out. That's around 3175 km. So if you're higher, you age faster. If you're lower, you age slower. Satellites tend to be higher than that, that's why they gain time. The ISS is much lower, so astronauts age slower. So yes, you are correct.

[@roelvankeeken]

You are right. the faster you go through space, the slower time will pass. Scott is therefor a bit younger

[@superveganwhat]

+Roel van Keeken thank you it felt like I was losing my mind with only a few people seeing that. there was another experiment conducted in the eighties using airplanes and sensitive clocks. the airplanes time was slower relative to the people on the ground

[@leandrodossantos9160]

Very smart observation brother, I heard it too but got confused

[@MaxLohMusic]

No, more gravity = less aging relative to the people in less gravity. Like in Interstellar. But I guess the speed difference might throw a wrench in it.

[@omargill3443]

If there's an annual meeting of time travellers.....do they just need the one meeting? :\

[@Master_Therion]

I've been waiting for this video... it's about damn time!! ;)

[@omegahaxors9-11]

Why wait? I saw this video 2 months earlier.

[@timedmosquito]

Since time was created and God was before time that means he's timeless. He has no beginning or end.

[@wesva2778]

I liken this to how the less aware of how much time is passing, the more time passes & the quicker it seems to pass. At school, if you're constantly looking at the clock, a class seems to take forever. At a party, you're so busy having conversations and dancing and eating or whatever, that an hour can just "fly by". How many times has anyone said, "Wow, it's already time to go?"

[@luismaoer7145]

2:05 you said c≈300 km/s unfortunately, thats totally wrong...

[@gravijta936]

I'm glad some one else caught that. Felt like I was taking crazy pills for a moment!

[@superveganwhat]

I don't know I think 300 kilometers per second converts over to 186,000 miles per second. but what I did think that might be wrong with the video is shouldn't the person going faster at 14000 miles per hour age slower relative to somebody on the earth who is moving at a slower speed relative to the person in orbit. I don't know maybe he is saying that the effect of the Earth's gravity being stronger closer to its Center has more of an effect than somebody going faster but I don't think so

[@luismaoer7145]

the speed of light is about 300 000 km/s

[@superveganwhat]

+Vegan for Good LOL you're right it should have been three hundred thousand kilometers per second

[@superveganwhat]

Do you think that he got it backwards about who ages faster the astronaut or the person on the ground? Every other time I've heard this scenario the twin who is moving faster relative to the other twin is the one that ages slower

[@marj736]

Agent Rectum here, if gravity and velocity can affect time, can temperature affect time too?

[@mattg141]

i thought people in space age slower since they are traveling faster.

[@superveganwhat]

yes thank you!!! I was going through the comments section and trying to find somebody else that noticed that he had it backwards too. everything else I have ever seen on time dilation says the person who is traveling faster ages slower relative to the person who is traveling slower. I remember many times having the scenario of a twin going in a rocket ship close to the speed of light and returning back to Earth having aged 7 years while on Earth her sister has aged 100 years relative to the twin who went on the rocket ship!!!

[@James01100011]

Depends on where and what they are doing. Gravity slows our clock compared to someone say just floating way past the moon. But for someone in low orbit, yeah you are correct.

[@superveganwhat]

+James01100011 I agree gravity definitely has an effect on spacetime which is why back in the day Russian scientist called solar mass black holes frozen Stars. someone falling into a large enough black hole large enough that the tidal forces didn't spaghettified them would see from their perspective all of time-pass and from our perspective watching that person fall in we would never actually see them fall in. you could question philosophically do black holes actually exist since from our perspective we don't actually see anything fall in due to time dilation. but of course they do actually exist since from the person falling ins perspective they would fall in which is at the core of relativity no frame of reference is special. I think a lot of people in the comment section are forgetting about the Symmetry being broken by the astronaut accelerating 14000 miles per hour and then decelerating when returning to Earth.

[@OurDarkGoldenHero]

I'm not alone. Thank god.

[@ulrikskadhauge2115]

The twin example is wrong - the good Scott Kelly is now younger than his twin - NOT older

[@FusionDeveloper]

This is my favorite topic in existence. Theories and information about Time Travel. I could watch a video every day about it that has different information.

[@nickbissanti]

Hey, I was watching videos about interstellar travel and ended up here watching all these time travel videos. And I had a thought. Could it be possible that the reason that we have not found signs of technological life on other planets, or rather that they have yet to find us, is that any other intelligent life may be living on a huge planet, way bigger than the Earth, in a solar system around a star much bigger than the sun, meaning they are much, much more effected by gravity than us? So from our point of reference, they are living at a snail's pace and consequently we are relatively much further into our own future than they are? Like if their civilization started exactly when ours did, but on a distant planet, and evolved at the same rate in their perspective as we did in our perspective, they would technically be a younger society than we are right now? I know the difference is almost negligible between us and those on a satellite but if the mass of the planet and the star they were orbiting were both drastically larger, could that possibly mean that they could be evolving as such a slower rate that they couldn't possibly keep up with our rate of advancement?

[@peterbarna6151]

wow, awesome work trace and everybody! i love the way this whole theme is put. THANK YOU

[@DNewsPlus]

Thanks! :D

[@rocklee5231]

sounds more like an alteration in the perception of time versus actual time travel by an increase in speed allowing more things to be done inside a segment of time making the observer believe the moment lasted longer.

[@tramsgar]

This series on time travel went by much faster than the one about wine, because this one was interesting and well written! Thanks.

[@mpc77769]

Great job throughout this series Trace, but especially the last 2 minutes or so of this episode. Nice summation 👍

[@DNewsPlus]

Thanks so much! :D

[@RovingTroll]

Honestly, some of the deeper physics stuff gives me the same kind of anxiety I get when I swim in the ocean, and there's nothing below my feet. Episodes like this sort of freak me out low key. And I love it.

[@I86282]

The problem with Stephen Hawkings experiment. Is that you still need a failure of the test. I mean obviously by sending out the invitations after the party. You could be assured no one was going to show up. But let's just say time travel totally exists. like it was a service that you could call and have performed for you. I could just hear the salesman now." Threw a party but no one came! Because you forgot to send invitations. well no worries. Prince of Persia Incorporated has got you covered. just give us the date and time and the thing you want changed. And it will be like it never happened in the first place. And all for the low low price of only,9,999,999,999,999." " But wait there's more. If you act now you can receive our Paradox free clean up service at No extra charge." But that's just my point. He would have had to of had the problem in the first place in order to require their services. And thus they would never be paid. So if time travel does currently exist. No one took advantage of it. Or it doesn't exist yet. In which case. He would still have to fail. Because he would have to wait until time travel was invented so that the persons he sent an invitation to could respond. So even if someday time travel does exist. We're obviously living in the reality where that kind of thing is still impossible. So it really was a failed experiment. Not because no one showed up. But because it failed to achieve results that could answer the question either way. In fact I would classify it now is even more of a parabola.

[@ferdinand9949]

The last time I was this early, Harambe was still alive... R.I.P.

[@yamenay]

original.

[@luismaoer7145]

german guy!!! yayyyy!! im not the only one!!!

[@ferdinand9949]

Ja dieser Channel ist richtig nice 👍😂

[@luismaoer7145]

ich liebe diese Sorte von Kanälen😍

[@ferdinand9949]

Ja das ist richtig nice. Ich hoffe ein paar Sachen von hier sind wahr

[@patrickpaslay5620]

so many ideas I can now play with due to this (and many other) episodes

[@yohasan308]

I love the thought of the self healing principle. If you think about it long enough, it makes everything you do in the past inconsequential. Events just happen differently and you still exist.

[@telsabernard09]

Would you guys interested in doing to sit on the slavery through out history. Like how It got started, The ramifications slavery , and our current situation?

[@DNewsPlus]

We've definitely considered it! Keep an eye out we might just do it. Thanks for the suggestion!

[@Vatsyayana87]

Slavery was crap and i think anyone sensible would agree. But try to consider everything it did, If it werent for the slave trade we wouldnt have the black population in the US that we do, sharing the greatness we all do today. So i agree it was a completely wrong way to go about treating other people but try to remember to honor them for their sacrifice that enabled you to be a free man or lady, and not just the fact that they were treated badly. They gave more then jesus ever did if he were real. So they deserve more then pitty.

[@streetcar7879]

don't you have that the other way around... going faster, slows time for the traveler?

[@katzenschildkroete]

My feet don't age slower than my head ... ...because I lay on my bed all day.

[@michaeldaugustine9249]

I'm sure a lot of people have noticed this, and it is a real recognized psychological phenomenon. The older you get, the faster time seems to go. When you're a 6 year old, one year is 1/6th of your entire life. A month feels really long, a year seems like an eternity. When you're a 60 year old 1 year is 1/60th of your life. It's the month of March one day, and before you know it, it's March again, but now you're 64... I've noticed it myself. When I was in school 6 weeks felt like forever. Three months of a semester or summer break seemed like forever. Now I'm 24 and it seems like just a few months ago I started my job, but it's actually been three years. What I'm about to say is completely subjective, so it won't seem like this to everyone. I've heard it said that by the time you're in your mid 20s, you've already experienced half of your life psychologically. When you're 40, you're actually middle aged, but before you know it, you'll be 50, and then 60, and so on. Most adults aged 50 and up remember their late teens to their early 30s most clearly, and everything after that just seems like a blur, and everything before that seems like it all happened at the same time.

[@thetrushocker420]

So, I read a while back that we are moving through space in a "forward" direction as everything rotates around eachother and so on. does time dilation change depending on what direction into space we go? if we were to let's say travel into space the opposite direction that the earth is heading with the sun.

[@kokomanation]

Time dilation due to velocity makes the time run slower for satellites in comparison with us on earth but time dilation due to gravity has the opposite effect.But time dilation due to velocity has a stronger effect in this case.And we have to subtract them to find the ultimate result

[@captainredbeard261]

I could totally believe in Chronesthesia in like a superstitious way. I've 100% had vivid dreams that actually happened play for play several years later, sometimes involving people I hadn't yet met and places I hadn't yet been even though I knew my relationship to them in the dream, and I know other people who have as well.

[@RafaelRabinovich]

With time dilation we can move faster or slower in the same chronological direction, but so far there is no reasonable way to take us backwards in time, unless we could go into the 5th Dimension and make a full turn. But that remains completely hypothetical.

[@thattassiewargamer]

Everything that has happened and WILL happen has already happened. If you can throw off the shackles of physical perception you can remember it all. Don't wait until you see/hear/touch/taste/sense something to perceive it has happened and it will come to mind even if it is in the future for many people.

[@brentnallsheath9589]

isnt time pretty much determined by particle collisions /quantum etc?

[@metasense7032]

tomorrow i will wake up and eat breakfast yes i can see the future

[@abah2077]

is that breakfast future 100% possible?

[@metasense7032]

yes,

[@abah2077]

***** *can you prove it?*

[@metasense7032]

I'll instagram you tomorrow :P

[@abah2077]

***** not good enough. you have to prove it before tomorrow comes.

[@AmeliaEvans]

Trace, great series. It was entertaining to watch you try and explain what is so difficult for us to wrap our heads around. I think we can all agree, by the end we wanted to take a syringe of coffee, vodka, or pain med straight to our brains.

[@johnilarde7087]

What is the meaning of "Relative" in this topic?

[@foreverblues1802]

I wonder how other solar systems, differ in time than our solar system. Especially the ones that are the furthest away from us. So for example if i went to a different solar system, and stayed there for a short period of time and went back to our current solar system. Which i then find out that it has been 5 years of earth years, would that be considered as Time travelling. Is that possible or even a real thing, Please answer if you see this Trace I am really intrigued in this particular subject.

[@falsevacuum4667]

Yes. Similar to what happened in Interstellar.

[@robinbrimalm9558]

YOUR LATEST CHANNEL PLAYLISTS HAVE THE VIDEOS IN THE OPPOSITE ORDER, please fix this.

[@robinbrimalm9558]

@Dnews Plus

[@plusnote1177]

Trace , I have watched so much of your shows , they have really interested me and have led me to change things in my life to pursue astronomy, thanks 😊 keep up this show

[@al1383]

Is it possible that the clocks on gps satellites need adjusting due to their distance from earth (longer route to make a full rotation around earth opposed to BEING on earth)? Or, if you place an atomic clock, in a hole the same distance that satellites are from earth, would the clock need time subtracted since it is rotating faster? (Nothing to do with the SPEED of the clock)

[@dsegaming4369]

Hey Trace so I am thinking about asking this girl to homecoming and I have a really good idea how to ask her except I need help with one thing. So my poster line thing is " You would really send dopamine to my brain if you said yes to HoCo (like Holmium and Cobalton the perodic table)" but my problem is that I don't know if I should put dopamine, serotonin, or oxytocin. I know all of these are happy hormones but I also know that some are related with drugs and sexual behavior which I don't want to put on my board. If you could help and tell me which hormone is the appropriate "happy hormone", that would mean a lot! thanks!

[@ventusluca]

“The mind of the subject will desperately struggle to create memories where none exist…” -R. Lutece

[@WinterIsComing25]

I'm surprised you didn't mention the use of cryostasis as a means of time travel

[@3rdEye2020]

*I watched this video 4 years ago...when I traveled into the future. I enjoyed it then too :)*

[@Z3t487]

Replying so you see the video again and this time is true.

[@Bristians]

Can you text in space ? Like if I wanted to text someone down on earth while I'm in the space station how long would it take for them to get it?

[@frozeneternity93]

One sure fire way to time travel is to have a looming deadline ahead of you! Then time just zips by!

[@abah2077]

fuck. I hate deadlines but you've gotta make a living right.

[@matteodelgallo1983]

Ehh, time is relative, deadlines doubly so

[@TheCip93]

hmmm i was wondering if the speed of light is the ultimate speed, in E=m*c^2 , lightspeed is at the power of 2.does that mean speed of light can increase ?

[@myjourney8339]

you should have a feature on your video that allows you to click or press the subject tabs to jump directly to different parts of the video.

[@WaveRain]

so if we can remember is time traveling back what bout dream's that end up as dajuvu does that count as you brain travel forward with your knowing?

[@fireincarnation2]

Time travel may require something already assembled in order to land in the past. So after we invent it, we could only go back to after the machine was made. Perhaps only nonliving things can be sent back

[@jalf0007]

Awesome job man! Keep up the good work!

[@dancefan9000]

Hey all. So I've been watching this channel for about the entire time it's been a thing. I've seen these complaints on videos going back a while. Here's my take. I don't care that there are no pictures and that there aren't always five episodes. First, if you've forgotten, this is a podcast that they tape. I don't see the point of adding pictures and stuff when I'm just listening. Plop your phone upside down and listen, that's what I enjoy doing. Or go find them on iTunes or SoundCloud. Second, there's not always enough information (that doesn't get super technical and reaches beyond the general viewers absorption abilities) to fit five videos. I'm fine with that. I appreciate the amount of time they research and prep and tape these videos. I'm happy to watch whatever they put out even if the topic isn't normally something I'd care about or if it's only three episodes. We could always request they do a second set on the series later in with more/newer information. No need to bitch about it... Have a good day everybody 👍🏼

[@DNewsPlus]

I love Lucy! :D

[@TheJCG9]

Almost Three hundred thousand kilometers per second... not three hundred km/s.

[@giorgostakousiis3748]

Hello! Please could you do a video on ''how does sneeze/cough affect our muscles and why sometimes we crick in the neck?'' Thanks for all the amazing episodes btw!!

[@rajeshwarihegdekeremane7470]

can you make a series on music?plzz..

[@Moechtegernpilot1]

Sooo does it means that I travel a view weeks Or months into the future if I would Travel into space, and if I would land on a planet into the past??

[@captainpointlez]

Dnews, do you accept suggestions for series by fans and viewers?

[@shreyvijayvargiya]

Real amazing stuff man. Thanks a lot for this.

[@612Tiberius]

Here's my own personal Theory of Relativity: The temporal phenomenon whereby time seems to pass more slowly whenever relatives come to visit. I'm sure many would agree......

[@devinjohnson1446]

what if we had a space station around the moon and propelled with the same amount of force it takes to take off of our planet but slowly gain speed as we approach the moon, not making contact with it.. try to stay in some sort of speed orbit..? or try the astronaut G-force test but in space?

[@vopall]

That was fun to think about. Great series! :)

[@zakkf794]

what is the speed of present time?

[@zillenille9832]

Can you do a dnews plus series of learning difficulties like dyslexia (would love to find out why people have them and what causes them).

[@charlessimba8491]

I have one thing. If you are out and running and listen to music then the song seems slower. BUT when you just woke up and listen to music its seems to go slower.

[@skylerslack5677]

Than is time dilation just a perversion as well?

[@MaGFarqui]

I loved this series! Thanks!

[@TarriPup]

Here is a thought regarding our perception of time: When we are younger, time seems to take longer, the days are longer, years are longer. But as you get older, time seems to speed up, the days grow faster, the years begin to zip by. If our life, up until the present, represents a value of just 1, and the number of years we live, which increase as we get older, are added as divisions of that value of 1, then at first, it would seem like time takes a long time say... at three years old, because our lives have only taken 3 segments to reach where we are in the present. But at say, 80 years old, that same value of 1 is divided into 80 segments, so observing those 80 segments across that value of 1, we perceive that each segment is now very short, time-wise, thus time moves faster. How fast will time move for us personally if we live 10,000 years? How much faster at 1 million? Would we be able to differentiate a single day outside of the moment of the present in which we occupy?

but we do see constantly into the past because light travels 299 792 458 m/s. as Michio kaku once explained. if you look into the mirror you are actually seeing your self in the past. even stars we see are actually a glimpse from the past due to the extreme distance light has to travel. the channel from vsause has also good examples of this in one of his videos. check out his channel. I like the way he explains things in an fun way.

[@DoneDragon1]

how would you tell you were standing still though universally?

[@SM_Price]

so... where can I get that tshirt?

[@jorgekajali]

I really enjoyed this topic, great content

[@GD-mn8sx]

So if time meats light speed it slows down never to surpass, light keeps traveling therefore time gaps are inevitably going to occur if time couldnt go faster, otherwise it would get stuck in a time frame but since time is infinite only motion can stop

[@zoodiac57]

I know that the conventional science won't allow any thought on clairvoyants and it hasn't been proven but if (big if) one could actually see the future that would pretty much prove that future as such really exists... so have yo had any episode on alleged clairvoyants ?

[@karlomijatovic4996]

What about when you dream something and few days or weeks later that same thing you dreamed happens, could that be some kind of time travell cuz you've seen what would happen?

[@electriccerix]

6:28 - Time travel technology would likely be extremely expensive, top secret, far in the future and risky so Ray would never be allowed to use it for something like proving their top secret technology exists to a college version of himself even if he managed to live long enough and go into the secret program.

[@jdoggem1]

IN ORDER FOR THE BROAD TO BE USING A CELL PHONE BACK IN THOSE DAYS, THEY WOULD HAVE HAD TO LAUNCH SATELLITES AND HAVE A NETWORK IN PLACE... THAT'S IMPOSSIBLE!!!

[@patrickpaslay5620]

If I created a story in my mind, and recalled it no photon could be involved, yet the memory still remains

[@mmenjic]

How far back can we go, why they did not came to us ?

[@RBsRealm]

Technically we are all living in the past because there is a delay between any of our sensory organs detecting something and the nerve impulses reaching our brains (and the times it take for us to become aware of those impulses)

[@bml1234567]

If our sensory organs stop working, then we are out of the Time game, except sleeping?

[@RBsRealm]

That is a brilliant question. Personally I'd say no, not completely. More along the line of isolated from it, you woulds still be aware that time is passing, you would just have no idea where in time you where and nothing about the world around you, however there has never been a case (at least one I've heard of or read about) where a human being has lost all sensory function, including complete loss of tactile, Proprioception & Vestibular senses (along with all others) whilst we've still been able to prove they are cognitively sane. Furthermore, because we don't fully understand the nature of consciousness, so we cannot properly measure it. The best way I can think to describe it would be like placing a person inside a box they cannot see or hear outside of, nor be able to feel that the box is actually there; "A prison for the mind that you cannot see, hear, smell or touch" - beginning to sound like the matrix here :P To the isolated individual nothing exists except their own mind, they would not be able to witness physical form again on any level. They would only be aware that they consciously exist, essentially being alone with their own thoughts until they died. We also have no method of studying such a case as of current, meaning that all I've said is complete speculation. Sleeping on the other hand is not complete isolation. It's close, especially considering deep R.E.M sleep, but it is possible for external forces to wake us, assuming we have a sense that can be interacted with. Sleep is more along the lines of shutting oneself in a quiet dark room (with a small door) if something external applies enough stimulus/force (knocking on the door) it is possible to make us leave the isolation of the room and return to awareness of time (being awake), consciously speaking that it. I'm not very knowledgeable on the finer details of unconsciousness whilst sleeping other than it important to our mental & physical well being. I know the body has an internal clock that works whilst sleeping but not much else.

[@StopChangingUsernamesYouTube]

Thanks for having me on the show! (Only timeline 40432 kids will get this.)

[@denharrison7704]

I don't think time travel will ever be remotely possible for us, not in a physical sense, it may be possible to fire atoms or electrons back and forth but to expect a human to travel through time in the sci-fi sense would be like asking packman to come toward you.

[@SweetMusiic]

Have a good day!

[@AnnaDamm]

When he said that the head ages faster than the feet. I wondered if the gravitational time dilation would counter that a little bit, cause the feet are closer to the mass of the earth..

[@jamesmesher6891]

Surprised you didn't mention DeJaVu? And since that's to do with seeing the future who's to say some of ours dreams aren't seeing some kind of past?... Mind BLOWN! lol

[@springinfialta106]

Just because theoretical Martians would have a different concept of day and year, doesn't mean time doesn't exist. It just means they're using different units. It would be like saying space doesn't exist because some people use the metric system while the US uses the English system.

[@ollinator3000]

Just a thought, because of paradoxes and all of the obvious hurdles that essentially make time 'travel' impossible as it's shown in Si-fi, surely the key to future space travel is being able to not time travel, but only space travel?

[@smyliejo]

The way I think about it is you can only time travel forward. It is physical impossible to go backward. You’d have to travel faster then the speed of light. Now there’s way more things I’ve thought about with going faster the light as far as movement but since I’m not an astrophysicist it is just simple thought based upon the theories I have heard about this subject with no scientific evidence to back it up. Just a fun thinking.

[@bml1234567]

If you want to stay younger, you may want to live in miles down underground apartments, because people who live on top of buildings grow old faster? You can observe multiverses together when the multiverses are within some nano-seconds?

[@Careless2445]

love what you do keep up the stellar work

[@chag3406]

That noble gas Tshirt is gold! Where can I get one.

[@ctre2]

Wait how can the speed of light be a constant if it's measured with a variable? 299792458miles per second... Isn't it possible that when the state of the "second"changes from faster to slower the speed of light is also effected accordingly?

[@ctre2]

This is more of a general question, not specifically just for that equation. Like hypothetically if we were to do that massive revolving calendar in space Thingy, wouldn't light also travel faster? And how would that effect us? Could we get more current snapshots of outer space?

[@mohansivadhas]

Is speed of light 300 kilometers per sec?? Or 300k

[@captainredbeard261]

So I just added philosophy to the list, but first you owe me batteries, quantum physics, DMT, and lighting technology. My theory is that the Time Travel course is a prerequisite to Quantum Mechanics to make sure we're all on board with kinda crunchy stuff.

[@buje90]

what is the time on the sun?

[@G2bb101]

This was by far my favorite series that you have done! I looked forward to it every day.

[@ColinJonesPonder]

I still think travel backwards in time is impossible, however, if clever minds did one day figure it out, I'm also convinced that that moment would be the earliest point in time that could be reached.

[@anuragshakya9163]

Astronauts travels at a speed higher than ours on earth hence time for them passes slowly than ours. Therefore they age slower than rest of us here on earth and not vice versa as explained in the video.

[@ying6726]

12:00 THANK YOU for saying time isn't real. This whole fascination makes me mad for that reason.

[@darrendelafield9427]

The last time I traveled back in time, I discovered the process created potential time energy like a rubber band. Once the forward process started, the potential energy was converted to kinetic energy and I was pulled back to beginning. Everything I changed snapped back to the way it was. I could not even prove the trip had taken place. Very frustrating. LOL

[@gomezmn]

i once saw a report on Discovery channel talking about danger and how we react to it (as human). well they listed an interesting theory (if one can call it such). they said that when we are in danger, we perceive time differently. we start to feel its taking more time than it actually is. And i remember them siting an example of falling down from a building on a big air bag. That the people doing it experience that its the fall is takin a long time. And they hypothesized that by saying that our brain at such moments will "think faster" than normal, and by such gives us "more time" to react. its like our brain goes super fast so the surrounding appears to be like in "slow motion". i donno if you can check that out, or if that is relevant to this. like we time travel in our own minds.