Time Travel | Wheel of Science with Neil deGrasse Tyson

– This week, we’re coming
to you from the past! – Chuck, everything we
experience through our senses has happened in the past. ‘Cause we see things not as
they are but as they once were because of the light
travel time between us. – That’s awful, especially
when you consider my past. – I don’t wanna know
your past, all I know is this is wheel of science. (upbeat theme music) – Hey everybody, Welcome
to Wheel of Science. – The interactive show where we answer your questions about the universe. I’m your host Chuck Nice and
I don’t answer your questions. We have with us as
usual the one, the only, Doctor Neil deGrasse
Tyson, what’s up Neil? You know I love doin’ that. So Neil, you’re beaming in from Vegas huh? – Yeah I got a gig tonight,
I’m giving a public talk on Astrophysics. There is some learning that
goes on in the town apparently. – I was gonna say, that’s
the most exciting thing I’ve ever heard happening in Vegas. Well one thing is for sure, We know we always win when we
bet on Neil deGrasse Tyson. – You’re really betting on the
universe when you bet on me, ’cause all I am is a conduit to it. – Oh, I meant bet on the black. Anyway, so Neil what time is it my friend? – Just spin the wheel. – There you go. (spinning noise) – [Chuck] Annaliisa Essi Katriina Lee says my daughters, ages eight
and eleven, want to know Would it actually be easier
to travel forward in time rather than backward and
what would that require? – Oh we can easily travel forward in time and we’ve known how to do that since 1905. Einsteins special theory of relativity lays out the whole recipe of how you can move into the future. And all you have to do
is go into a sort of a lower gravity field
relative to other people. Or just travel very fast and
your clock will tick slower than that of everybody
else that you left behind. Then when you return, you’ll
be younger than your twin for example, if you had left
your twin back on earth. So, in that sense you are
traveling into the future. That’s easy to do, and
we’ve known how to do that. Traveling backwards, that’s the problem. And it takes, we think we can do that. I have some colleagues
who’ve made some calculations that … assert that depending on a trajectory intake around a
black hole you can come out and end up in the past
of when you started. So … but that takes extraordinary set up to make happen. But right now, no problem
traveling into the future. – So, its either lower
gravity, travel faster than the speed of light, or
very good moisturizer. (Neil chuckling) – Not only that, the GPS satellites, which are farther away from the center of the earth than we are. They experience less gravity than we do. The GPS clocks tick
faster than our clocks, yet we’re getting our time from them. And so they know this in advance, rather. We’ve programmed in the
relativity correction to compensate for this
fact, So when they do give us the time, it’s the right time not the relativistic time
that it wants to keep by being where it is in orbit. Awesome! – Alright Neil, you ready
for the next question? – Spin the wheel! (spinning noise) – How, theoretically,
might time travel via wormhole work? Whoa! – Oh yeah, so, a wormhole enables … By the way if you manage to travel some place faster than light, you have the capacity to
move backwards in time. We’ve got that one established as well. We just don’t have any easy way
to travel faster than light. But one way that’s been
celebrated in science fiction and you can write it out on paper legitimately, is a wormhole. A wormhole, I’m over here
and I wanna get over there and I wanna get there quickly. I wanna get there before the
end of the commercial break. So, you can travel through a wormhole that changes the effect of
distance between where you are and where you’re going,
and then you sort of look around when you get
there and you find out, Oh my gosh, I’ve traveled
100,000 light years in a matter of a moment. When you do that, you
have the capacity to move backwards in time,
relative to when you left. Now, you don’t get to visit yourself. You’re in a sort of a different space-time trajectory. So you can’t shake hands with
yourself before you left. So if that’s what you’re
thinking of doing, no. And by the way, There’s a huge paradox that people worry about. And many people including Steven Hawking, the late Steven Hawking,
worry wether this paradox would prevent backwards
Time Travel completely. Because if you go back in time and prevent you parents
from meeting one another, then they wouldn’t of
ever given birth to you, to go back in time to prevent
them from meeting one another. – First of all let me just say, I stopped listening when you said I can’t shake hands with myself. Alright we have to take a break now but we’ll be back with
more of your questions and a caption contest. Featuring a picture of
Neil doing something weird. – [Narrator] Thanks to Wix
for supporting this episode of Wheel of Science. Have you been on the fence
about making a personal or professional website? Wix is here to help you get it done. Loads of templates for any need. Dozens of fonts to match your vision. Wix has you covered! To create your own
professional website go to wix.com/go/StarTalk. Make sure you use that
special Star Talk link. We also put it in the description. Hey send us your sites in the comments! – Welcome back to Wheel of Science it’s time for another question. You ready, Neil? – Spin the wheel Chuck! (spinning noise) – Erik Varga wants to know this, What would you say is the most accurate time travel show or movie and why? Oooh. – Hmm … It’s really hard to do, an accurate movie and still have interesting plot lines. So … given that, they take some loosey goosey steps with time travel, I have to say that Doctor Who as a TV series is the most invested in the authenticity of their
time travel story telling. And so, they thought
about the contradictions and the paradoxes, and they
have their own solutions to all that. Now on the state side, I
would say there’s nothin’ like the original Back
to the Future movie, the first one. That one they thought it through, they imagined consequences. So I give both of them
sort of equal high ranking. As a special mention,
gotta love Bill and Ted. Bill and Ted’s excellent
adventure, come on. I mean, that’s a special
runner up/special mention for time travel exploits. – All three very good, the
most disturbing of the three definitely Back to the
Future, Where you have to make sure that your
parents smash, so that you can be born. Okay everybody it’s time
for our caption contest, where we took a picture of Neil, and you provided the captions. And the winner is Harry Schalk with, “Astrophysics, they’re grrrrreat!” – Two thumbs up on that one. – So my caption was,
‘Cause you’re like this, I once saw a black hole this big! But, they didn’t like it,
they didn’t like it Neil. Time now for our Wheel of Science poll. If you could Time Travel,
would you travel to the past, or the future? Make sure that you answer the poll and leave comments on this video. Hey everybody, that’s our show, and as usual it’s a pleasure to have the one the only Neil
deGrasse Tyson with us. Thanks Neil! – Chuck I’m delighted to
always be in arms reach of you no matter where I am in the universe. – Yeah and I know that’s
how you like to keep me, at arms reach. Don’t think I forgot about
that restraining order. – [Narrator] What website
will you make with Wix? A photography site, a wedding
site, a personal site? Wix will help you get your
site up in just minutes. Don’t believe me? I created the WheelofScience.com on Wix in the same amount of time as I created all three of my children. Okay, that’s, almost correct. You can see it for yourself,
I was able to embed every episode of the show on the site. I added custom thumbnails for each episode so they each look special. I just had to click on the
text boxes in the template to put in titles and
descriptions for each episode. There’s no reason why you can’t start your site right now. Even a comedian can do it. Go to wix.com/go/StarTalk and make a professional website today. You can upgrade it and add your own domain and get some great extra features with their premium plans. Click on that link in the description, and get started on your
website right away. – Hey everybody, until next time. I’m Chuck Nights saying
thanks for watching Wheel of Science! (upbeat outro music)


  1. StarTalk

    October 7, 2019 at 6:06 pm

    When in time would you travel?

  2. Pastor Peewee

    October 9, 2019 at 1:26 am

    Why in space videos from NASA can we not see all or any satellites?

  3. Skull Island Silver

    October 9, 2019 at 1:58 am

    I take back the mean things I said about Mr. Nice. My apologies.

  4. Duane Hastrich

    October 9, 2019 at 1:59 am

    I love it!

  5. Phizicks

    October 9, 2019 at 2:12 am

    3:00 you also forgot to mention to take into account not only less gravity but also the speed it's travelling as well

  6. Low Down

    October 9, 2019 at 2:13 am

    Awesome picks Neil!

  7. Benjamin Gasiorek-2022

    October 9, 2019 at 2:33 am

    Kinda wished they mentioned interstellar

  8. Scott Cox

    October 9, 2019 at 2:45 am

    The future is easy, but looking back is painful. Everyone's either a crook magician salesman, or a schmuck. That's the future looking back at today.

  9. Grim Reaper

    October 9, 2019 at 2:58 am

    To the future

  10. Emory Livers III

    October 9, 2019 at 3:04 am

    The future… all day

  11. Ivan Andonov

    October 9, 2019 at 3:30 am

    Future of course

  12. The canary Is dead

    October 9, 2019 at 3:36 am

    Time isn't linear. It's merely a ripple on the surface of water. Travels out in all directions.
    The entire universe behaves as the same, the surface of water.

  13. October 9, 2019 at 3:40 am

    So what if you go back in time and pretend to be someone else and then date yourself?

  14. Snow S

    October 9, 2019 at 4:07 am

    Did he just say the n word? lol or am I hearing things 7:56

  15. Joshua Andres

    October 9, 2019 at 4:38 am

    Lol nice

  16. M o o d

    October 9, 2019 at 5:09 am

    Wouldn't the travel forward method actually be time overtaking you?

  17. r315r4z0r

    October 9, 2019 at 5:15 am

    The anime Steins;Gate has some pretty cool time travel concepts in it. Like sending a text message into the past and influencing the actions of the recipient to change how future events play out. For instance, imaging sending a text to your past self about what the winning lottery numbers were.

  18. Julen PadronesLi

    October 9, 2019 at 5:45 am

    Low gravitational field, slower time or faster time relatively to a higher gravitational field?

  19. ali ali

    October 9, 2019 at 6:08 am

    lier lier lier lier lier lier

  20. ali ali

    October 9, 2019 at 6:09 am

    earth is flat……this is the fact
    earth is stationary….this is reality

  21. Spring Griffith

    October 9, 2019 at 6:40 am

    When will season 2 of the Cosmos going to be released? It’s like 7 months late 🙁

  22. Lee Jun Fan

    October 9, 2019 at 7:00 am

    bill and tedd haha

  23. Prem.G .Gaikwad

    October 9, 2019 at 7:03 am

    Definitely future becoz past I know and future is always interesting.

  24. Puke Witchwalker

    October 9, 2019 at 8:00 am

    The Dark Wheel sends it’s regards.

    Ancient plasma discharge events are mankind’s witnessed creation history, fast forward to today and man has amnesia and ignorance of this truth his ancestors tried so hard to survive through and preserve.

    Thunderbolts project yt channel has solved the obfuscation of all world religions and myths and creation stories into one coherent truth that will blow your mind.

    Please check it out if you want to Gknow mans mystery.

    o7 Cmdr

  25. Naveen Gwalia

    October 9, 2019 at 8:58 am

    40 yrs into the future

  26. Electro PMSH

    October 9, 2019 at 9:38 am

    i think time travel backwards is possible with a set of rules which computed to the time where nothing will be disrupts. So that means we can travel in the past where there were no humans in the planet only other alien life forms that we could not be able to interact with or we can travel backwards in time but the consequence is there is changes in our ability to perceives things to prevent paradoxical moments. its like you can go back time but unable to see same color phenomenon as you usually see and you are unperceivable because of the mixups of radiation and chemicals due to process of time traveling. another thought is that, its like we are already looping to the past but what we perceives is the present.. well that i think why we compute light years in far distance because there is already a loop in the past and present in disguise as our future.

  27. Taraknath Biswas

    October 9, 2019 at 9:43 am

    What is doppler effect and how is it used to find exo planets????

  28. Siddharth Ahuja

    October 9, 2019 at 11:12 am

    Utmost respect for Dr Tyson…awesome man..great aura. Keep up being amazing!

  29. deadfred821

    October 9, 2019 at 12:02 pm

    Poll: the past for a plethora of reasons. The near past for self help & advice; extended for even deeper self help; the distant past out of morbid curiosity of historical accuracy & the far distant past for (essentially) the same reason.

  30. wilsudi

    October 9, 2019 at 12:15 pm

    Chuck should go back to school and learn what being funny means

  31. Bells Cells

    October 9, 2019 at 12:32 pm

    And this my friends is why the white race hates us

  32. antiisocial

    October 9, 2019 at 1:10 pm

    Quantum Leap. Lol also Bill and Ted is awesome! Can't wait for the next one

  33. Sandile Mtolo

    October 9, 2019 at 2:08 pm

    7:56 They didn't like it n…?

  34. Prashant Vyas

    October 9, 2019 at 2:43 pm

    How do they even know wormhole exists or not

  35. Sylvia Brooks Funchess

    October 9, 2019 at 3:41 pm

    Please NDT keep both your feet on the floor.

  36. Kavi Kumar

    October 9, 2019 at 4:29 pm

    Guess he is not a marvel fan

  37. Alexandria Otimex-Cortez

    October 9, 2019 at 4:56 pm

    Neil looks like he needs to travel to last night and get 8 hours

  38. Eerie Conspiracy

    October 9, 2019 at 5:26 pm


  39. Engelbertus

    October 9, 2019 at 6:04 pm

    Only information can travel backwards through time and not further backwards than when the first time machine is turned on – now… sit on that one for a while

  40. The clan 3,000

    October 9, 2019 at 6:15 pm

    Ive literally just subbed and i don't regret it . Thank you so much for turning up in my reccomended . NDT is the link between humans and understandable science . He is also very handsome 🙂

  41. Derrick Thomas

    October 9, 2019 at 6:32 pm

    Id travel to the beginning of everything.starring in Gods Glory as he utters how did u get here!

  42. kubek

    October 9, 2019 at 7:03 pm

    I'd travel to the future, got winning lottery numbers, came back. I'd probably see a news headline of me winning while in the future because Novikov principle would be in effect.

  43. matrix strobe

    October 9, 2019 at 8:11 pm

    I'd like to travel back to neils college days and see if he actually got any qualifications

  44. Cypherous

    October 9, 2019 at 9:25 pm

    To the future, the past is boring 😛

  45. DaMeshMonster

    October 9, 2019 at 9:53 pm

    This dude is corny. He supposes to be the comic relief?

  46. Mark Wilharm

    October 9, 2019 at 11:18 pm

    My choice would be travel to the past, might just end up nowhere travelling to the future if there is none.

  47. Alejandro González

    October 9, 2019 at 11:25 pm

    When Neil says "this…" I feel like he is about to unleash his power


    October 10, 2019 at 12:34 am

    Outside of gravity atoms have the potential to radiate more frequently or faster pulses which is whats used to keep track of so called time, has nothing to do with time travel. Also the faster one travels the slower this happens because of the increase in gravity or compression of energy hence aging slower.. Total BS!!

  49. nirbija

    October 10, 2019 at 1:43 am

    Somehow I don't think that past and future 'events' are as scientists imagine them to be.
    For instance, the thought of going back into the past and preventing one's parents from mating isn't sensible.
    It's like asking how many elephants can fit on the head of a pin.

    Just because we may have any idea doesn't mean that every idea is meaningful/practical relative to our present circumstances.

    In other words, the notion of so-called 'time travel' is pure, unadulterated nonsense. lol

    Truth is; I'm yet to learn from any one of these so-called scientists a proper description of exactly what this mental construct, time, is.

  50. nirbija

    October 10, 2019 at 2:08 am

    Am I missing something here: A clock 'ticking' faster above the Earth, because it is in a weaker portion of the Earth's gravitational field, doesn't mean that somehow that 'heavenly' clock is 'in the future' any more than a clock back on Earth keeping its own faster time compared to another clock is in the future? lol

  51. CardboardUmbrella

    October 10, 2019 at 2:43 am

    Neil has never seen Primer.

  52. Casey Stotz

    October 10, 2019 at 2:46 am

    Time travel cant be possible cause u cant see ur parents or other ppl in the future if they r in the present.

  53. Jay Flippen

    October 10, 2019 at 4:18 am

    2:12 And it probably wouldn't hurt at all… There would be no intense tidal forces, shearing, or spaghettification. Ba-dum ssss

  54. SMD sth91

    October 10, 2019 at 4:40 am

    Would I be able to time travel to the past by inhabiting the body of my younger self but still remember the events of the future and prevent tragedies from happening during my early childhood years? Just like in the Japanese TV Drama, "Erased".

  55. Digital Demonic Davros

    October 10, 2019 at 4:56 am

    So you can't travel through time whilst on the planet. If it where possible how would you fix the position paradox? Where you need to predict where the planet will be when making the leap in time.

  56. The Unlikely Atheist

    October 10, 2019 at 5:26 am

    If we were to travel backwards in time…my initial thought is youd be shredded by pre-existing photons. You posit a separate timeline/continuum/fabric. Can you explain a little more. I know that isn't a lay subject per-se

  57. telletran

    October 10, 2019 at 6:15 am

    Traveling to the past might not be possible but it might be possible to view the past. All you have to do is catch up to the light that bounced off the event you want to see. Simple?

  58. Mayur Valvi

    October 10, 2019 at 7:52 am

    Funny and educating video ! Perfectly balanced !

  59. WillTell

    October 10, 2019 at 8:25 am

    I'm traveling into the future right now! Because time is relative!

  60. Neo Khesa

    October 10, 2019 at 8:40 am

    DeGrasse Tyson papa

  61. Compete ToDefeat

    October 10, 2019 at 9:47 am

    I love that Neil sort of slipped right into the type of role Carl Sagan held years ago, the public personality and face of science. He's definitely on my list of people I'd want to sit down and have a conversation over dinner with. And the addition of Chuck Nice's comedy makes these types of shows even more enjoyable to watch.

  62. William Petersen

    October 10, 2019 at 9:59 am

    What about the movie: Interstellar ?

  63. Rebecca Black

    October 10, 2019 at 10:45 am

    ezekiel 38-39 the gog and magog from beginliving

  64. Matthew Vu

    October 10, 2019 at 10:49 am

    NDT is annoying AF

  65. Im A Lover And A Biker

    October 10, 2019 at 11:46 am

    See you yesterday was really good too! (Time Travel movie on Netflix)

  66. Wilton Gomes

    October 10, 2019 at 11:53 am

    Not happening. Ever

  67. Shreeshail Ganore

    October 10, 2019 at 3:43 pm

    What about interstellar????

  68. jpjrodriguez

    October 10, 2019 at 3:58 pm

    First Neil says, a clock will tick slower in a lower gravity then half a minute later he says GPS experience less gravity and their clocks tick faster than earth clocks. Am I missing something or is he contradicting himself?

  69. Mr. Burns

    October 10, 2019 at 4:06 pm

    I'd love to be able to travel into the future..Seeing things that haven't occurred can be really beneficial..You can programm your every move accordingly once you know what is going to happen

  70. Phil Mensah

    October 10, 2019 at 4:48 pm

    What if should I travel into the future, I encounter an obstructive spacetime….like I get hit by a train….I'd rather travel to the past cos I know where n when it's spacetime have been

  71. Alicia Pink

    October 10, 2019 at 5:12 pm

    I most definitely want to travel in the future. I want to see how my life turned out.

  72. Indrajeet roy

    October 10, 2019 at 6:43 pm

    You'll not be younger after returning. Theories are fixed

  73. Haris Shah

    October 10, 2019 at 7:06 pm

    Even if you do move back in time there will be nothing there because the rest of the universe will be in the future. Unless you move the entire universe back in time except yourself you cannot go to the past.

  74. Carmine Martino

    October 10, 2019 at 8:57 pm

    OMG the host is so funny

  75. Carmine Martino

    October 10, 2019 at 8:57 pm

    OMG the host is so funny

  76. Ala Bayoudh

    October 10, 2019 at 10:13 pm

    I think Neil made a small mistake involuntarily at 1:42. when saying that you need to go to a lower gravity field relative to other people to travel in the future with the time dilation effect, but it's actually the opposite, the more gravity you got the fastest you travel through time.

  77. D'arcy Leland

    October 10, 2019 at 10:48 pm

    I already traveled to the future to prevent the Nazis from winning the war.
    I traveled to 1776 to meet Mr. Frederick Muhlenberg. 😀

  78. James T.

    October 10, 2019 at 11:15 pm

    Less comedians, please

  79. Gabriel Hudson

    October 10, 2019 at 11:18 pm

    What a load of bunk!

  80. Erno Ristola

    October 10, 2019 at 11:33 pm

    So, if you want to see who killed JFK and from where, all you have to do is travel the right amount of light years away from the Earth (using FTL) and just look back with pretty big telescope? 😀

    Just a joke, don't massacre me with science, please :p

  81. Kevin Gomez

    October 11, 2019 at 1:46 am

    I thought he said "they didn't like it ni".. lol

  82. Zachary A. Hampton

    October 11, 2019 at 1:59 am

    Primer is my favorite time travel movie.

Leave a Reply