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TexDen t1_ixfe7w9 wrote

If you believe that Mars may have once had water and supported life, well, you can clearly see what happened to Mars. It is now a desert world devoid or water and life.

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phred14 t1_ixfoc6o wrote

That had more to do with Mars' small size, cooling of the core, loss of magnetic field, and solar wind.

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StackOverflowEx t1_ixg4nx0 wrote

Not only that, Mars is on the outer edge of the goldilocks zone with a slightly oblong orbit, which takes the planet farther out of the zone for half of its year. If Mars had an atmosphere 343 days of its 687 day year would be extremely cold globally. A Mars with an atmosphere would be too harsh for complex life.

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