I recently wrote a Discovery Space piece titled "Is Warp Speed Possible?" and the fuel efficacy issues really fascinate me. How much energy would you need to outrun a beam of light on a jaunt across the galaxy? First, let's refresh on warp speed travel. According to Einstein's theory of special relativity, light is the universal speed limit. Nothing travels through space faster, and approaching it causes time to slows down and mass to become infinite. In other words, cosmic fat days last FOREVER.