Sorry, no space colonies for you yet

Talking about the space exploration and building self-sustainable settlements in space or on other planets, we need to remember that humanity so far could not achieve self-sustainability even on the water, in a friendly environment of our home planet. When your old home vessel will start leaking, can you manufacture the new one, while on the water? No. So, before dreaming of space colonies, go back and do the homework then.

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