Our Moon is the nearest and most likely place for humans to colonize in the near future. It has a hostile environment where air and liquid water as we know them on Earth are not to be found. In the past astronomers hypothesized that comets are the source of water on the Earth and Moon. However, calculations by Svetsov and Shuvalov published in Planetary and Space Science indicate that when a comet impacts the Moon it is likely that 99% of its water evaporates into space and is lost. On the other hand their work indicates that asteroids have been hauling water to our Moon and depositing it in places which are very handy for future human colonists. Specifically it appears probable that 2 to 4.5 % of lunar craters are likely to contain substantial amounts of water in the form of hydrated minerals. These asteroid impact craters are a convenient source of water and solar energy for lunar bases and are likely to be the home of human lunar colonists.

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