Einsteins light beam....Lets go for a ride...again I am not directly in the physics field, but I use physics at work and have always been enamored by it. If I did not post this question in the right place forgive me. So here is my ponder if you will. I read Walter Isaacson's book when it came out a few years ago, and kept thinking and imaging riding that beam of light that Einstein rode many times in his head. Than I thought about the power of light. If you have a flat plane (imagine our world is indeed flat) and turned on a light and you start backing up while always looking at the light. Soon the light to you the observer has faded with the distance. Does this mean the beam of light has stopped? if riding at the tip of the beam does that mean that you would stop to? Then increase that size to the sun and start backing about from the sun at some point the light can not go any further I imagine, so where is the absolute light? I think about this because we use light to calculate time in light years. right?