What About Light

29 October 2012

Given my earlier post, what if something travels at the speed of light like, say, light? Suppose you were to look up in clear, dark, night sky and see the Andromeda galaxy. From our point of view, a photon hitting your eye left Andromeda about 2 million years ago. From the photon’s perspective, the instant it is emitted in the Andromeda galaxy, it strikes your eye.

How cool is that?