What is the speed of dark?

Most of us already know that darkness is the absence of light, and that light travels at the fastest speed possible for a physical object. In short, this means that, the moment that light leaves, darkness returns. In this respect, darkness has the same speed as light. However, in some instances, darkness actually moves faster than light.

Disco ball moon

What if the moon was a disco ball?

The moon is not a disco ball and a number of impossible scenarios would need to take place for it to act like one. But, says Vsauce, it is interesting to imagine what would occur if it actually happened.