Prometheus Posted May 23, 2019 Share Posted May 23, 2019 How does Venus retain its atmosphere without a magnetosphere? If it can keep its atmosphere in its current orbit does it follow that it can in Mars's orbit? Or are other factors like tidal forces involved? Link to comment Share on other sites More sharing options...
Sensei Posted May 23, 2019 Share Posted May 23, 2019 Venus 's escape velocity is similar to Earth's escape velocity. Venus atmosphere is made of CO2 with rest-mass 44.011 u per molecule, and it's slightly more than Earth's O2 32 u and N2 28 u (accordingly 37.5% and 57% more). i.e. there is needed less energy to eject Earth's molecule from atmosphere than it's needed for Venus's molecule. Link to comment Share on other sites More sharing options...
dimreepr Posted May 23, 2019 Share Posted May 23, 2019 (edited) 4 hours ago, Prometheus said: How does Venus retain its atmosphere without a magnetosphere? If it can keep its atmosphere in its current orbit does it follow that it can in Mars's orbit? Or are other factors like tidal forces involved? Mars' orbit would seem to be less stressful in all/most cases, wrt it's atmosphere. Edited May 23, 2019 by dimreepr Link to comment Share on other sites More sharing options...
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