Is Time Travel Possible? - The Science of Time With Neil deGrasse Tyson

Whether time travel is possible is among the most intriguing questions in all of science. Neil deGrasse Tyson explains how time travel into the future is possible through Einstein's general relativity theory.

Time travel is a widely recognized concept in philosophy and science fiction. But is it truly possible in real life? What does physics tell us about time travel? Is it possible to travel to the past? There are some physical theories that can help us learn what time travel is and how it works. Neil deGrasse Tyson explains the nature of time and the conundrums of time travel.

In Einstein's theory of special relativity time slows down or speeds up depending on how fast you move relative to something else. So, for an observer in an inertial frame of reference, a clock that is moving relative to them will be measured to tick slower than a clock that is at rest in their frame of reference. This case is sometimes called special relativistic time dilation. Time dilation may also be regarded in a limited sense as "time travel into the future. The faster the relative velocity, the greater the time dilation between one another, with the rate of time reaching zero as one approaches the speed of light.

While some physicists argue whether time travel is possible, theoretical physicist Carlo Rovelli thinks that time is in fact illusion and our reality is just a complex network of events onto which we project sequences of past, present and future.

Neil deGrasse Tyson is quite possibly the most famous astrophysicist if not the most famous scientist of our time. He is a science communicator and author and he explains in layman's terms whether time travel is actually possible. Neil deGrasse Tyson has written numerous scientific books, his latest is "Letters from an Astrophysicist".

#TimeTravel #NeilTyson #Science

Sources:

[eprotz]

Now I know what to do with the 2 black holes in my backyard.

[bobbythespaceghost]

Man...I've always had an interest in this. It's such an interesting topic.

[mariojumpmanmario]

The fact that it’s possible to time travel into the future is just mind blowing to me. I just want to use time dilation to go into the future and see how advanced earth gets.

[dardangashi]

This video literally explains of what happened in Interstellar (2014) movie. How they used a black hole to move forwards in the universe. And how staying 1 minute in the planet they landed on resulted like 10-20 years in Earth.

[KennethHaineskbh]

We are all time travelers. Apparently, it is a one-way street.

[bandog]

With all the crazy wild events going on in this world I don't doubt it

[nickmordente]

“TONY STARK WAS ABLE TO BUILD THIS IN A A BOX OF SCRAPS”

[jessetoons]

If we invent time travel then it won’t be a surprise to our future relatives if we visit them considering they invented it. We will have older and younger versions of our selves visiting each other

[coin]

Video: Time travel
Thumbnail: The avatar breaking out of his iceberg

[rezadaneshi]

I think it's much simpler. It's never going to be a paradox. Time moves at the speed of light. That's why time stops if you travel at the speed of light. Even if you survive the round trip back to kill your grandfather and came back, the timeline you killed your grandfather is moving into its future at the same speed that your timeline you came back to is, and the two will never intercept. Wait 50 years and go back to that time line, you'll see you don't exist there and you had created an alternate timeline. If we ever discover anti graviton, the best we could do is visit either the past or the alternate timelines we have created.

[balaboy]

The two black holes thing sound more like standing still in time rather than actually going back.

[teeheeteeheeish]

Einstein had the best quote. You can’t travel to the past, because that’s already happened.

[Wesley-Insley-Comedy]

This Channel has become one of my favorite! Fascinating ideas and videos

[Antifag]

This could've been a 1 second video. I would've gotten a chuckle out of Dr. Tyson just saying "No" and then the credits rolling.

[frpl]

Since it also takes some time for information to get to our brain from all of our sensory inputs (or even for a thought) we are actually stuck in the past not in present :)

[asfrflagcommunity]

How to travel through the fifth dimension using only four dimensions

1. Go back in time to desired era
2. Change events
3. Go back to altered present day

[ramsyrama]

It's very possible because we all can agree that many things that were impossible 100 years ago, are now fulfilled

[extropiantranshuman]

so crazy cool how tyson summed stuff up for us. I do like how he focuses on time travel, as it complements Musk's focus on simulations and Bill Nye with space travel

[keithbloomfield]

Why does everyone discussing time travel ignore movement? There are two relevant movements to consider - 1. Nothing stays still or locked in position - planets have orbits, galaxies have orbits etc. 2. Expansion of the universe. These 2 movements mean that if we go back in time, nothing will be in the same place that the traveller started out - by many billions of miles. Time travel will therefore send us somewhere else entirely. The expansion of the universe is extra interesting because it only expands going forward in time - go backwards in time and it shrinks!

[marybethkramer]

Couple of list of things I want to do while traveling back in time?

1. Stop Heath Ledger from ODing himself
2. Stop James Horner from getting himself killed in the plane crash
3. Pervent Chadwick Boseman from taking a bad diet
4. Stop the COVID-19 from existing