Relativity Explained

Short Words to Explain Relativity

Old Al, he came out the blue and said, "Not only do rays move at c if what puts them out is held fast or not: they move at c even if you are held fast or not." Now that may not look like such a big deal on the face of it, but hold on. What this says is that you can move as fast or as slow as you want, and rays will go by you at c all the time. You can have a pal run past you and when you both look at a ray go by at the same time, you will both see the same ray go by at c! That is a bit wild, no? You, back in that void, you just can not say if you move or not — with the lamp or no. Not that you can’t tell: it can’t be said. It’s moot!