Hi Larry
Mark Bullock and David Grinspoon have suggested that the oceans lasted for long after Kasting's original guesstimates. It's possible that as the ocean began leaking away, through the stratosphere, oxygen levels built up to quite high levels. This would've either killed off an early biosphere or encouraged it, perhaps letting it leap forward to the metazoan level. But the oxygen would've risen inexorably and eventually have wiped out that biosphere - though it might've been a race between the water loss, heat levels and oxygen poisoning.
Perhaps the Venusians survived and moved elsewhere? I won't suggest they might be us as the timing is all wrong. Perhaps they seeded our planet? Perhaps, but if they existed there's no apparent trace of them here beyond that and it's a bit odd that's all they did.
Adam
Space/Science » in reply to Speaking of Venus...
Early start
The whole thread (34 posts)
- There is a place in the solar system away from Earth (not artificial) where conditions are much more similar to our world than what we find on Mars....Where is it? (n/t)