I Comparing the formation of the atmospheres on Earth vs Venus

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The discussion centers on the atmospheric formation differences between Earth and Venus, questioning whether Earth's spin rate or moon tidal effects contributed to its thinner atmosphere compared to Venus. Participants note that Venus may have initially had a climate similar to Earth's, but its current high gas pressure and temperature raise questions about the greenhouse effect and the fate of its water. The role of solar wind in shaping Venus's atmosphere is also mentioned, highlighting the complexity of atmospheric evolution. The conversation emphasizes the need for concrete sources when discussing these scientific topics. Overall, the comparison of atmospheric dynamics between the two planets reveals significant differences rooted in their formation and environmental conditions.
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Could earth have had a Venus-sized atmosphere, lost by spin-moon effects
Read Venus stats for first time yesterday. Could the spin rate at accretion time reduce Earth's atmosphere relative to Venus, or are there moon tidal effects, e.g. mixing and carrying heat to upper atmosphere allowing escape velocity losses, to explain the 100 fold difference?

I have heard that Venus may have had an Earth-like climate initially?? The grey body temperature at Venus orbit is 45 degrees above earth's, and that ~100 fold gas pressure seems unlikely to have started from nothing, so I would expect some greenhouse effect - sounds a bit hot for life - and where did all the water go?
Did the lower H2O weight allow differential evaporation??
 
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What research have you done? Are you familiar with the effects that solar wind had on the atmosphere of Venus?

And, by the way,
stuartmacg said:
I have heard that ...
Is not an acceptable citation here on PF. If you want to discuss something, it has to be based on a concrete statement from an acceptable source.
 
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