What cataclysm do you envision destroying life on Earth if we have the technology to survive on Mars? Surviving on Mars means that we can survive in freezing temperatures, with deadly levels of radiation, without a breathable atmosphere, without fertile soil, with little to no liquid water, and with no source of power but sunlight that's 60% weaker than on Earth.
Destroy life on earth. I phrased it as a tautology to be humorous, but very large impacts are possible. I doubt life would survive an impact such as the one we hypothesized to have created the moon.
reply