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As to life existing; We did the rough calc once in an Astronomy course. Given the stars in the Galaxy, The relative few that have planets, and the planets must be the right distance from the right type of sun, and then the had just the right amount of atmosphere, and that life started and that evolved to a point where space travel was possible before the species had wiped itself or its planet out, we came up with approx 5 to 10 civilisations in our Galaxy with spaceships. Thats just in our gala…