Whenever he thought about it, he felt terrible. And so, at last, he came to a fateful decision. He decided not to think about it. ~John-Roger and Peter McWilliams
Question #27542 posted on 09/14/2002 midnight
Q:

Dear 100 Hour Board,

Why do we never see the backside of the moon?

-Gary Blackburn

A:
The moon's rotational period (the amount of time it takes to spin on its axis) is 27.3 days, give or take a little time for fluctuations caused by gravity from the Earth and other large celestial objects. The period of revolution (the time it takes to make one orbit around the earth) is also 27.3 days, which means that as the moon revolves around the earth, it turns on its axis so that the same side is always facing the Earth. Thus, from an earth standpoint, we never get to see the "Dark Side of the Moon."

-Pink Floyd Fan