Quote:
Originally Posted by truedream
What are you trying to tell "atmosphere was mainly taken away by the solar wind because the magnetic field disappeared"
because of which magnetic field disappeared?
I think you are trying to say same thing without clear explanation, which I have sad, The end of dynamo effect in liquid core of mars was the main reason for disappear of atmosphere. The end of dynamo effect will remove geo magnetism of the planet.
However, mars images very strongly suggest that it had running water and thick atmosphere earlier in its history.
Yes present water in mars can be remaining water of 10% to 30 % of total water of mars.
What happen to 70% water (water and atmosphere) of mars?
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Investigations by satellites around Mars have found that is has no internal magnetic field. However, there are remnants of what used to be an internal magnetic field. Mars core cooled down too much and could not sustain a magnetic field anymore. So, the Martian magnetic field disappeared like 3 billion years ago (if I am not mistaken by a billion or so).
So, then the solar wind had free play, and stripped Mars of its atmosphere (well most of it). There was nothing "anti gravity at work".
Like I said the atmosphere (and that includes the water) was stripped away by the solar wind. That happened.
And it seems, IIRC, that if you would take all the ice at the poles and melt it you would be able to basically cover the whole of Mars with an ocean. So, maybe we have to look into why Mars still has so MUCH water, instead of so little.