Celestia Forums

...and mars dumped somewhere safe to avoid collisions.

Now, let's look at Venus. Now that it is in a cooler position, what happens? Does the atmosphere stay the same temperature, or does the surface also cool down a little bit?

I'd guess that what would happen is that things would generally stay the same for a few thousand/tens of thousands of years. That said, IIRC Venus' greenhouse effect isn't 100% perfect, so it'd slowly lose heat with a much smaller amount of heat coming in to warm it up again. I think.

Don't expect water to magically appear though just because it cools, Venus is dry as a bone.

Well, we need to do something with Mars. Can't just junk it, you know!

What would happen if Mars were in Venus' orbit?

...John...

Dollan wrote:What would happen if Mars were in Venus' orbit?

It'd dry out. While it could still keep its CO2 at that temperature, it wouldn't be able to retain water vapour in its atmosphere anymore. It'd be so hot there that the water and CO2 ice would melt rapidly, boil off in the thin atmosphere, and then get lost to space pretty quickly.

I already knew what would happen to mars, so that's why I didn't bother with it. :p

How about leaving Venus and Mars where they belong and swapping rotations? Or giving Mars the same rotation as Venus. And Venus the same rotation as Jupiter. Now what will happen?

cartrite

mmyes and how about a nice jovian ammonia haze for Mars, a couple of them Calypso sized satellites and a metallic hydrogen core... now what will happen?

(anyone said fruit salad?)

With a jovian planet in Mars' orbit, I said good luck for our Earth...

Our planet would be only a second (or first because of the distance to the sun) asteroid belt

...And Venus the same rotation as Jupiter...

venus the same rotation speed as Jupiter?
won't it burn itself?

wait... speed causes heat only because there's friction right?
and i doubt there's frcition in space, so....

i guess venus won't self-combust even if it rotates at high speed.

but probably this will churn up huge hurricanes in venus's atmosphere?

Since Venus rotates once every 243 days, speeding up the rotation to once a day or every 12 hours would distribute the suns energy more evenly instead of baking just one side all the time. Wouldn't some of the atmosphere be lost to space thru centrifugal force? Does anyone know what the temperature of the dark or night side is on Venus? Is there a difference in temperatures between night and day? Mabey that would change.

cartrite

cartrite wrote:Does anyone know what the temperature of the dark or night side is on Venus? Is there a difference in temperatures between night and day?

I think it stays constant, the atmospheres so thick that heat is convected evenly all around the planet.


I read a thing a long time ago (damnit, I cant find it now ) that if Mars had formed where Venus is, Venus had formed in Earths place, and Earth had formed in Mars orbit, then possibly all three of them could've held the right atmospheres to be perfectly habitable - now that would be interesting
OF course thats only if they had formed there in the first place, if you just moved them to those positions nowdays then Mars would boil away, Earth would freeze out, and Venus wouldnt change much...