Neil deGrasse Tyson’s Guide To Time Travel — StarTalk 101

How would time travel work? Journey back through some of StarTalk’s favorite time travel moments from the past, covering topics like The Grandfather Paradox, wormholes, and tachyons. Featuring Brian Greene, Joseph Gordon Levitt, Colin Jost, and more!

What would time travel look like to an outside observer? Learn about how time travel through wormholes would work, The Grandfather Paradox, and whether the timeline cares about major events versus minor events. Is time travel to the past even theoretically possible? We break down ways we are already time traveling through time dilation. What would it be like to look at time from a higher dimension?

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Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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Timestamps:
00:00 - What Would Time Travel Look Like to an Observer?
3:36 TIme Travelling Via Wormhole
5:18 - The Grandfather Paradox
12:16 - Time Travel in Looper
17:00 - Causal Loop Paradoxes
19:49 - If There Are No Time Travelers Now, Could There Be in The Future?
22:44 - Time Travel in Interstellar

[StarTalk]

If you could travel in time, where or when would you go?

[LTDunltd]

The other side of the The Grandfather Paradox. Look at Fry from Futurama.
Another time travel paradox. You travel 30 years into the future to visit yourself only to find out you've been missing for the past 30 years.

[usnluna]

I love the idea that no matter what you do in the past, it will not change anything. You go back and change something in history, return back to your original time. When you get back to your original time you notice nothing has changed because what you went back into the past has already happened before you left, because you left back in time to change it.

[DodgyDaveGTX]

I love how Neil constantly retells the same anecdotes, examples, or analogies when explaining a point to someone different each time but always with a consistent level of enthusiasm and chuckling.

[abiofficial-wspn]

Two channels I love, have uploaded videos related to time travel on the same day. Science Asylum, and Star Talk.

[michaelcalder]

Brian May of Queen wrote a song about this many years ago. It's called 39 and it brings a tear to your eye...

[zaxko]

Found Star Talk by accident and love it. Within a week I was surprised to see him on Big Bang Theory and then Brooklyn 99 to help Gina. Terry might be buff but I believe he's much stronger than Terry. Charles cracks me up. I think there the power couple of astrophysicist even though chuck isn't one I believe. Would love to see Neil at a show around Florida. Both are great and plan on listening to this channel at work. Work sucks but both make me feel smart while working.

[FutChamps]

Dude Neil is a genius! His knowledge of astrophysics is amazing. I’m literally doing a massive project and essay on his impact on society! Keep it up 🤩

[ACrowNamedPoe]

In Futurama, Fry did the nasty in the pasty and became his own grandpa 😆

[TorQueMoD]

I love the last one the most where Neil is talking about the 5th dimensonal scenes in Interstellar. Really cool :)

[MegaDeano]

It's good to see the great thinkers of the world, looking at the pressing problems, truly humbling.

[Vicki-Paz]

i love neil sm, i can listen to him for hours

[Zurpanik]

Two ideas about not seeing time-travelers in our time now: 1) Perhaps there is some unfolding of the future universe which will allow through its expansion backwards time-travel, but since we live in a time with no time-travelers we can imagine that such a change has not happened yet and so cuts off access to our time now from in the future, or 2) since we do not have relativistic-velocity vehicles or craft, any time-travels that DO visit us, would be STUCK! They'd not be able to return to the future -- In one or both of these ways there might be a kind of "time horizon" where the time we find ourselves in now simply cannot support or does not make it a good idea to visit us from the future. Love this stuff!

[jurisauzins]

Just a thought - Given that we have a telescope powerful enough, and if we would place a mirror large enough far enough, it should be possible for us to see the earth in the past. So a mirror 1Ly away would show 2 years in the past and so on.

[BenjySparky]

Neil and Chuck, y'all rock! Peace

[Ben-Ken]

J G Levitt is in some of my favorite movies. He picks great projects.

[norcalpacific]

THIS IS an OLD RE-UPLOAD. You should be putting that in the description to let people know the original date.

[spazbog]

I have already traveled back in time. I flew from Australia to the US and I arrived in the US on the same day I left but it was earlier in the day than when I left. Only a few hours before I left but I also traveled for 17 hours. I would not advise trying to travel back in time the other way around though, you will wind up in the future.

[shellsel]

I just want to know when déjà vu occurs or jamais vu, could that your future or past self interfering with your own timeline (from the 5th dimension or higher) and that's the residual memory (for deja vu) or non-memory (jamais vu) of it still being there for your current "present" self?
I wonder if my past/future self is messing with me (intentionally or not) when these things occur lol

[SydMountaineer]

Sadhguru said something about space & time not being differentiated from each other, in I think, the older or current Hindu language - that there was/is just one word that meant/means both. So, maybe space & time aren’t different things???

Sadhguru also points out that the only reality is the present, the past is memories in our minds, and the future is fantasy, which is also in our minds - this makes the most sense to me when thinking of time and space, together as one.