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Moon Habitat Versions
Since the Moon is closer than Mars, it is more likely to build a habitat structure on Moon first for testing the structure before it is applied on Mars. Therefore it is important to develop an alternative design for Moon as well. Unlike Mars where the equator is the best place for a habitat on Moon the best place is on the poles. A complete rotation circle of the Moon needs 28 days. For 14 days, when permanently exposed to sunlight the surface gets extremely hot (130°c), while for another 14 days it is permanently dark, and temperature drop to -160°c.
Only on the poles sunlight is permanently available. Sunlight comes horizontally but in a changing azimuth which does a complete circle every 28 days. The differences of temperature are less extreme there. Furthermore there are craters on the poles where sunlight never enters so they are permanently cold enough to contain and keep ice.
Two ring shaped mirror membranes reflect the sunlight entering horizontally, twice into the inflatable building. The lower mirror ring is surrounded by a ring embankment of regolith which protects of radiation from a low angle.
Moonhabitat version inside a Lava Cave. These caves provide good protection against radiation and meteorites, but they are dark.
An inflatable parabolic mirror in a synchronized rotation with the Sun reflects sunlight through the shaft into the cave and into the inflatable building. Sunlight is permanently available, 24 hours per day, for growth of plants and keeping the temperature inside at a convenient level. In the vacuum on moon no heat can be transmitted or convected from the inflatbale building. Just the heat radiation remains.