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1wiseguy t1_j20g9dy wrote

Reply to comment by wesphilly06 in Earth was brought to life by ancient water-rich asteroids from the outer Solar System by marketrent

If you want to transport water or gases from Earth to Mars, the amount of mass necessary to make a minimal atmosphere or any kind of ground water is staggering and impossible.

Steering an asteroid or comet to collide with Mars is also quite a trick, and finding one that's headed roughly for Mars could take quite a while.

These things are great for a sci-fi story, but in the real world we have laws of physics that we must answer to.

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carpiediem t1_j24t3gc wrote

I don't think anyone is suggesting bringing it from Earth. You're right that comets would be tricky, but we can manage a lot when given a millennium or two.

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