Ancient Venus

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Ancient Venus

Post by marasama on 21st September 2010, 2:34 pm

http://www.universetoday.com/74100/hot-atmosphere-of-venus-might-cool-the-interior/
So, earlier Venus could have been hotter?

Also, if Venus was very hot where the crust was fluid (not necessarily molten).
Could we have a setup where a planet that has no crust?
If the crust constently mixes with the uppermantle.

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Re: Ancient Venus

Post by Sirius_Alpha on 21st September 2010, 3:10 pm

marasama wrote:Could we have a setup where a planet that has no crust?

Sometimes (especially in discussion of tidal effects on warm Jovian moons or hot SuperEarths with outer Jovian companions) there's discussion about tidal heating being enough to "melt the moon." CoRoT-7 b is often talked about as having a molten surface.

Might depend on how one defines a crust.

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Re: Ancient Venus

Post by marasama on 21st September 2010, 3:40 pm

Well, if molten rock does not mix and forms a layer.
Then that molten rock is a crust or ocean of molten rock.

But if it mixes with the mantle, then there really is no crust.

But then again, how far should the mantle go down and if the mixture stops at a certain depth.
Sounds like a difficult geological question here.

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Re: Ancient Venus

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