A long time ago in a galaxy far, far away…. Not just the star wars intro, but a true statement if you’re an astronomer.  You see, once we start to look deep in space at the more distant objects in the universe, we are actually looking deep in time as well.  It all begins with a light year. A light year is not a measure of time, it’s a measure of distance.  When you turn on the light in a dark room, the light appears to fill the room instantly.  But it actually takes a small amount of time, as light has...