1) "Theory 1: Darkness does not move, it is always present, and light is layed on top of it. (As an analogy, consider a table as being darkness, a tablecloth as being light: when you pull the tablecloth off, the table itself (darkness) doesn't move).
Theory 2: Darkness moves at the same speed as light, and it meets the laws of motion in that Darkness is the equal and opposite reaction for the action of the movement of light.
Theory 3: A man stands at the doorway of his bedroom, attired in boxer shorts and a sleeveless undershirt. One hundred times in a row, he turns off the light switch and dashes for the bed. How many times does he see himself land under the covers? Zero. There isn't any light there. Obviously dark got there quicker than light. Ergo:
Let " d" equal the speed of dark
d = SQRT( e/m ) + 1