re: Colonizing Mars- really what’s the point?

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There’s a planet in the Alpha Centauri system called Proxima b that’s in the habitable zone. That’s our closest and best chance for a fresh planet

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Say we aren’t alone in the universe. Wouldn’t it be a kick in the teeth if we found a habitable planet, found some way to get there, and then found out their version of humans already wrecked it?

All that work just to find a worse off earth.