Travel thru space is very demanding: - need air, water, food - need protection from radiation & debris - need to support generations of ppl
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if u wanna get technical, earth is more like a living compartment in a larger space travel vehicle; sun is the engine, rest is spare partspic.twitter.com/NnMGuPisT9
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getting spare parts can be tough...easy stuff is where we live, harder stuff is in colder, harsher places like the arctic or asteroid belt
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