More Earth Like Veuus ?

[zenzil]

More Earth Like Veuus ?
If Venus had a rotation similer to Earth or Mars and a Magnetic field like ours, how could it be ?

[Ken G]

Venus has a very thick atmosphere, so shares its solar heat to the night side and thus its slow rotation doesn't really matter much. The lack of a magnetic field means it gets hit with more high energy particles from the Sun, which might have made it harder on life on the surface, but the really tough thing is that Venus is too close to the Sun to have any effectively way to deal with the carbon dioxide that leaks out of its crust. That causes a whopping greenhouse effect and makes it very very hot-- a problem more fundamental than anything having to do with rotation or magnetic fields. So I think it would be pretty much the same as it is now even if it had Earth's rotation and field.

[Ronald Brak]

I suppose an interesting question would be is there anyway for a planet in Venus's position to be at all earthlike?

[Ken G]

Perhaps early in the solar system, when the Sun was a little dimmer and maybe Venus hadn't outgassed so much carbon dioxide yet. Of course if you go too early, you get pounded by meteorites and volcanoes, so you can't win. But who knows, maybe Venus was once like Earth, until it suffered a runaway greenhouse effect and the oceans boiled off.