Neil deGrasse Tyson Explains Time Dilation

"If you can't explain it simply, you don't understand it well enough."

Neil does it effortlessly. Amazing video.

To me, the craziest thing about this is how Einstein conceptualized these theories in his time. I wonder how much different things would be today if he had never lived and we had to wait 50 years for someone to come up with these in say the 1950's or 1960's. Einstein is the GOAT in science without a doubt.

I said this to a friend some years ago. On a hypothetical world moving much faster than we are through the universe, if they were to look at us through a telescope, they would see the whole of human existence has already passed by. On a hypothetical world moving more slowly, it hasn't even begun.

If you take that concept and stretch it out, you see that because of the way time works in our universe, it preserves a perfect copy of our lives. In a very real sense, each of us has always existed, and always will exist.

Imagine having a teacher like Neil for all of your school and university stages.

No matter how many times I hear this explanation I still can't wrap my brain around it.

Chuck Nice is smarter than all of us think he is. He really understands and questions things we wouldn't. I love it

I consider myself to be smarter than the average bloke, but I am constantly impressed by Chuck’s lines of questioning AND his snappy comedical quips. His contribution is what makes the format of Star Talk so succesful. Fascinating and entertaining at once!

Mind blowing stuff. I recently watched "Interstellar" and so many references are made to Einstein's theories such as time dilation and gravitational effects. Great film!

really cool to see chuck’s aha moments, and the depth of his questions. Thanks chuck for translating for us!

I remember as a teenager learning that time travel is definitely possible, but only going forward in time. It's just a one way trip. Gives new meaning to "I'll hit you into next week".
It also boggles the mind that if a photon has no time, then a light-year really is extremely large.

These two need a show. A REAL show like late night.. Absolutely insane. And this is why I love science..

I feel so privileged to be able to enjoy the ramblings of our greatest minds at any time. TY Universe, Chuck, and Neil.

Even though science wasn't my thing in college, Neil breaks this down in a way that I can understand. Mind successfully blown.

After seeing how much Chuck figured out and understood on his own, it's starting to look like he should be in line for an honorary degree! He has had the best teacher... it was really fun watching Chuck realize he knew what was going on and paraphrasing/explaining with glee. This was fun to watch.

I am always obsessed with space and future tech type concepts. Time Dilation has been something I could never really grasp much until this video. Explaining how the photon from 30,000 years ago doesn't experience any time itself made so much sense, it's a good comparison to show why people experience less time when traveling near that speed.

Nuc med tech here. Love that I knew most of this, but you explain it so well that my mind is reconfiguring how I look at my surroundings!

I’ve honestly never wondered if light aged,or not. But finding that out that it does not,is a mindblower.

"The photon has no knowledge of that trip." I can never un-hear that. Now, I too will lay awake, staring at the ceiling... knowing the light from my neighbors porch light, the light from the moon, the light from Saturn, the light from the center of the Milky Way and the light from the edge of the known universe all reach my eye in exactly the same amount of time (relatively speaking from the photon's perspective)...

Thankyou for the explanation. After two years of watching YouTube on time travel, now I understand.

thank you Dr Neil and Mr Chuck,
Im a huge fan of science and you by far are my favorite Astro Physicist! I love learning. Thank you for your contributions in science