I Comparing the formation of the atmospheres on Earth vs Venus

[stuartmacg]

TL;DR Summary

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??

 

[phinds]

What research have you done? Are you familiar with the effects that solar wind had on the atmosphere of Venus?

And, by the way,

I have heard that ...

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