How fast is the speed of dark?

[zanias]

All physical mater by wich light goes trought slower it, can it be water, glass or air or whatever because the light doesnt move as a straight line except in perfect vacuum.??The path of the light is curved by the gravity of each object and even small atoms.

Ok, all I want to say to this is that light never truly runs in a straight path. If you look up some of Einstein's theories you'll find that the fasted way, for light, to travel from point A to B is in an eliptical. Light bends, even in a vacuum, due to gravity, as well as a physical substance such as glass or water.




I talked to another friend who agrees that Dark doesn't move. Darkness is the constant, and the constant can't move. Light just cover's that constant up, and therefor can be measured. Does darkness have a speed? I don't think it does.