Luna

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Luna, Earth's moon, experiences extreme temperature shifts during its month long cycle of light and dark, like many worlds with no atmosphere. It is only habitable inside domes, which contain atmosphere and equalize the temperature shifts.

Dome

Domed lunar cities begin to crop up across Luna in the 2080's, mostly used as way stations and fuel mines for orbital refueling stations. Luna also serves as a meeting place for Earth dwellers to meet with those who were raised in low gravity environments, for whom Earth's gravity would be dangerous.