Water on the Moon

Scientists have discovered the moon has its own water cycle.

Previously shadowed areas of the moon are said to not only contain ice crystals, but large bodies of water.
The finding further proves that if escape from earth was crucial to the survival of humanity,
terraforming the moon is a definite possibility, and most likely are best bet at the moment.
As Stephen Hawking has said, departure is of the essence.

where did the moon come from?