Gott believes that because our species' time on Earth is very likely to be finite, we should be doing everything we can to colonize nearby worlds — particularly Mars — to increase our odds of survival. Putting a permanent colony of humans on Mars would be an insurance policy against a civilization-ending catastrophe here at home, like an errant comet or an accidental outbreak of thermonuclear war.
It's a weird argument for colonizing other planets because each other planet we colonize would actually have the end of humanity sooner than here.
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