whoa.
Thank god we did not evolve on Mercury. Working out heliocentrism may have been confusing! (We ignore the heat issue for now.) https://en.wikipedia.org/wiki/Mercury_(planet)#Orbit.2C_rotation.2C_and_longitude …pic.twitter.com/LgbpiN8re9
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Kim Stanley Robinson dealt with the heat issue by having a domed city on rails roll around a spot on Mercury's terminator. The sun's heat would widen the rails on that end, rolling the city into night.
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