We need to know the ancient Earth’s atmosphere (& Mars, Venus) Estimate the history of atmospheric escape from data OR make guess from exoplanets or Titan. We need to know what kind of bio-molecules can be formed in different space conditions.
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Transport of life in space?
(4) Understanding vehicle (asteroid, comet, meteor)
Today, we exchange views of Venus)
very little role
Ionopause pressure (PB) balances with both SW dynamic pressure (PD=swvsw2) &ionospheric plasma pressure PP (= ikTi)
#1) depending on relative extent of ionosphere and exosphere
#2) because non-thermal > thermal for Earth-sized planet
The ancient condition is this extreme.
Ionopause vs. SW/IMF (minor)
(d) strong (stable) IMF no change as long as SW PD > SW PB
(e) variable IMF lower balance altitude (by cancellation of B)