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Originally Posted by SpaceManAndrew
 if i remember rightly the theory of relativity is to do with the fact that you can't travel at the speed of light as energy=mass x (speed of light)squared.
if you work it out it says that as you go faster mass decreases but energy increases. so you'd need to be weightless in order to carry enough fuel to go at the speed of light. i think |
I think that's part of it, but there's a load of other stuff in there too, like time being relative. So time seems to travel slower for people moving faster than you, relative to your frame of reference or something.