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A few weeks ago an astrophysicist (I think) was interviewed on your show, and he said something that needs to be talked about more if it's true (and given I heard him correctly). Unfortunately I don't recall which episode it was nor what the actual topic was on which he was interviewed. Anyway, what he said was that time moves at the speed of light. And he just mentioned it in passing when talking about something else. That's a terrible thing to say and then not explain why that is, isn't it?? That's many hours of good sleep I won't get back! Jokes aside, is this really true?!
Actually, yes it does.
I don't know why you would think otherwise.
I mean, the only way you could disagree with that is you don't like the way it is described.
In technical terms, time doesn't ''move'' and if you're hating on that because it was described so simply, I guess you would be right.
However, for practical purposes, yes, time in fact moves at the exact speed light moves.
If you flashed a beam of light at a theoretical planet which is 1 light year away, you would see the beam after 1 year, the time it would take light to get there.
That is because we define something ''happening'' as seeing it happen.
So, a 1000 light year-away star exploding would, in relative terms, happen at your location in a thousand years, ie. after the light of the explosion reaches you.
This is just a matter of definition, so for practical purposes, happening (or time) happens at the speed of light.So that is a simplified explanation.
Except for the fact that not one physicist, cosmologist, astronomer, astrophysicist or any other physical scientist would ever speak in those terms. And I know that as a fact.
Except for the one you mentioned in the post just before this one and many others I've heard.
You have to understand that these scientists are catering to the general audience.
They are explaining it in a way that a layman (and not even necessarily that bright of a layman) would understand.
I am well aware that time isn't something that literally exists. It's just a measurement of how soon something arrives moving at a certain velocity.
So, for example, one would experience no passing of time while moving at the speed of light.
Suggesting that I should read the philosophy of physics is completely preposterous, though. I know that I understand the philosophy of physics.
time moves at the speed of light
I don't think it's a very useful concept. As I understand it, any object moves through spacetime at the speed of light.