Giant Lava Tubes Possible On the Moon

schwit1 writes: New analysis of lunar geology combined with gravity data from GRAIL suggests the Moon could harbor lava tubes several miles wide. "David Blair, a graduate student in Purdue's Department of Earth, Atmospheric and Planetary Sciences, led the study that examined whether empty lava tubes more than 1 kilometer wide could remain structurally stable on the moon. 'We found that if lunar lava tubes existed with a strong arched shape like those on Earth, they would be stable at sizes up to 5,000 meters, or several miles wide, on the moon,' Blair said. 'This wouldn't be possible on Earth, but gravity is much lower on the moon and lunar rock doesn't have to withstand the same weathering and erosion. In theory, huge lava tubes – big enough to easily house a city – could be structurally sound on the moon.'" You can read their paper here (PDF). If this is so, then the possibility of huge colonies on the Moon increases significantly, as it will be much easier to build these colonies inside such lava tubes.

Comments

Low gravity (Re:Stupid.)

[mi]

There is no point in building large cities on the moon. Seriously, why? If you want to live underground, do it on Earth.

One use would be for retirement communities — the thought occurred to me some 10 or 15 years ago, but then read about it somewhere in Heinlein's writings.

The low gravity of Moon would allow the elderly (and other infirm) to remain mobile for many years after they would've become wheelchair-bound on Earth... Considering the wealth of (relatively) many of the elderly in the Western world, they may be able to pay for such retirement even before some other industries take hold up there.