Where Does Light Go? Why is the Universe Dark?
[caption id="attachment_3236" align="alignright" width="480"] The Andromeda Galaxy (M31)[/caption] Where does light emitted from a flashlight go? On a universal scale, what happens to all the light? If Space is not infinite, goes the line of incorrect reasoning, then all the light that has ever been radiated by stars and galaxies should make the Universe a blindingly bright place. Hence, the universe, based on this reasoning, must be infinite. But, if the Universe is not infinite, the light should bounce back and forth, building up. Most scientists consider the universe to be expanding, yet not infinite. So where does all the light go? First, let's discuss what light actually is. What Is It? Light is a form of energy that radiates outward — radiant energy. Radiant energy can be readily absorbed,…