[pfdietz]

Even after a KT-level impact, the Earth would be more habitable than Mars is without an impact.

In any case, to be a backup, Mars would not only need to be economically self sustaining (in the sense of earning more than it cost), but it would have to be able to produce absolutely everything it needed to survive and grow, as Earth would no longer be available. Every material, every component. Everything. This means not planting a colony, but planting an entire global economy.

[gpm]

The presence of other humans would make earth distinctly less habitable than mars - they would tend to shoot at your delicate glass domes to try and get your resources. Moreover the unexpected nature of the impact means you don't get a nice stable earth manufacturing base to set up the habitats on earth, while you do have a nice stable earth manufacturing base to set up the habitats on mars.

[pfdietz]

> The presence of other humans would make earth distinctly less habitable than mars

This is some Atlas Shrugged level nonsense. The presence of other humans is essential to making Mars habitable. The colony will need a huge economy just to make all the materials and things it needs.

[titzer]

> This is some Atlas Shrugged level nonsense

Have you met humans before? Like, the humans that perpetrated the countless wars throughout history? Slavery, the holocaust? You think that animus has been exterminated or something?

Imagining that we're all going to be cooperative do-gooders because we all hang out on HN and love open source is the "Atlas Shrugged level nonsense." It'll be a mad house.

[gpm]

Read the full comment instead of quoting a soundbite. The problem is desperate other humans not just other humans.

[pfdietz]

I stand by the statement.

You'd don't get to conclude that having other people around is bad because there could be desperate people among them. Having other people around also delivers huge benefits, such as providing the gloriously diverse global economy that allows one to manufacture the Mars colony equipment in the first place.

I get a Galt's Gulch stench from some of these fantasies of Mars as sanctuary.