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Message: <blockquote data-quote="Pbartender" data-source="post: 1815084" data-attributes="member: 7533">Of course not.  That's why all of our space probes and telescopes haven't found any standing water on Mars.  That's why you'd have to terraform it to create standing water.Gasses could be locked in solid or liquid form beneath the planet's surface.  it is theorized that warming Mars up could produce enough outgassing from the planet itself to increase its surface pressure from ~0.7 mbar to 50-150 mbar...  roughly 1/10th earth pressure at sea level.  That would be enough pressure to allow free standing liquid water.You can create earth equivalent pressures on Mars, it just takes a thicker atmosphere to maintain the same pressure, since the gravity is lower.Low gravity might cause some atmosphere to slip away, but it would be an exceedingly slow process on the order of millions of years.  Essentially, in the far upper reaches of atmosphere, air molecules may travel a very long distance without colliding without another molecule.  If the molecule's velocity exceeds that of the planet's escape velocity, it stands a good chance of shooting off into space, never to return again.  For planets like Earth, Venus and Mars, that's only a real concern with the lightest elements...  Hydrogen and Helium.The real concern for Mars would be the solar wind eroding the atmosphere, since Mars has a pretty magnetic field.  The thicker atmosphere that comes with an earth normal pressure on a light gravity world would help alleviate that.</blockquote>

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