/sci/ - Science & Math

>>12157414
life didn't arise independently twice, it started on mars and got to other planets via panspermia. the unknown great filter to advanced life is that even planets like earth don't generally remain hospitable to complex lifeforms long enough for human-like species to evolve. earth only has roughly 300 million years left, and only managed to reach humans due to rudimentary life starting on mars 500million to a billion years before earth was even hospitable. it takes multiple nearby planets, hospitable over different time spans, to create a human level species

How did planets that once had water on them lose water?

Even if the surface temperature increased, wouldn't that just make the water turn gaseous but stay on the planet? It wouldn't just drift out of the atmosphere and away from all that gravity right?

>>4017667
>Mars certainly had plate teconics until at least a billion years ago, to assume that it didn't then have volcanoes is kind of bizarre..
We're unsure if Mars ever had plate tectonics, and the volcanoes stopped emitting copious amounts of CO2 around 3.8Mya ago.

>>3577958
I remember watching a documentary on that topic.
They had a CGI mockup of Mars with a full atmosphere and liquid water, and they showed it getting blown away by Solar winds.

Many a tear were shed man.

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