Why build colonies on a planet’s surface, rather than underground? The ground provides shelter from radiation and may be helpful for building pressurized environments. Get what little sun is available anyway with skylights.https://twitter.com/thedailybeast/status/997495802783248385 …
Replying to @ToryAnarchist
But if that were true, anyone planning to colonise Mars would have to be really interested in digging machines. Oh.....
8:38 AM - 18 May 2018
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