Both bases are planned for the same small areas near the south pole because of the near-constant solar power available in this region and the rich source of water that scientists believe could be found in the Moon's darkest regions nearby.
Unlike the Earth, the Moon is not tilted relative to its path around the Sun...the never-setting Sun casts long shadows over nearby craters, hiding their floors from direct sunlight for the past 4 billion years, 90 percent of the age of the solar system.
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