Found this light hearted article at NASA,
http://science.nasa.gov/headlines/y2...htm?list149304
Talking about the physics involved if one were to try and play tennis on the moon, when it is colonised in the future.
At 1/6th of earth's gravity, even the ball toss would take ages to come back down.. would be a very interesting sight
Worth a read anyway, for a bit of fun.