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> It is a truth universally acknowledged, that a single species in possession of a good technological base and a will to survive, must be in want of a interplanetary kinetic asteroid redirection system.

It's like the planet evolved an immune system against asteroids. It even brought autoimmune disease along, aka nuclear MAD.

Then there'll be that one stone that's too big, and we'll have to wait for a whole another species to come up and try again

I'd love to know who "we" refers to in that sentence. ;-)

That's funny.

It's either the guests at the restaurant at the end of the universe.

Or just a universal peanut gallery that we all can imagine we belong to.

And that's why some people want a self sufficient Mars colony: so evolution doesn't have to start with small mammals again when that happens.

It would be waaaay easier to build a self sufficient colony hundreds of feet below the ice in Antartica. And there would actually be a reason to want to survive.