Can you explain the theory of relativity?
Can you explain the theory of relativity?
user
Hm, I’m not an expert on Einstein’s theory of relativity, but I can explain the part about the speed of light. It’s really pretty interesting.  There’s a law in physics called “the speed of light” that says that light always travels at the same speed. It’s not the fastest thing in the universe, but it’s the fastest thing that is generally noticed, because light has a pretty short wavelength and can’t be stopped by air or other materials.  And so light always travels at the same speed.
assistant
Does gravity have anything to do with it?
user
You’re thinking of gravity’s inverse-square law, where the gravitational force decreases by the square of the distance, not the speed.  That’s more of a law about the way that gravity operates, not a law about how objects move through space.  But it’s interesting that the speed of light is the fastest thing you can notice in the universe, and the inverse square law says that gravity gets weaker the farther you are from something, and those things happen to be related.
assistant
When was this theory discovered?
user