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Watsisname
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09 Jan 2017 00:27

To be more clear, it's an interesting question, but not the sort of thing we could feasibly figure out.  In particular, having Venus and Mars form in the same place would lead to a chaotic situation where they interact with one another, and the outcome could be a very large number of things which depend extremely sensitively on the initial conditions and is therefore basically impossible to predict.  In other words, I dunno!  ¯\_(ツ)_/¯
 
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DoctorOfSpace
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09 Jan 2017 00:39

I suspect that meant to say Mars where Venus is, but even then there is no way to really figure out any of this.  
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JackDole
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09 Jan 2017 02:14

What if Venus formed in the place of Mars and Mars formed in the place of Mars, along with Uranus and Neptune switching places and Pluto and Ceres switching places at the start of the solar system?
If Mars were where Venus is, he would presumably be a warm desert planet, just like Dune (Arrakis), only smaller.

If Venus was where Mars is, she might have a less heated atmosphere. The air pressure might be lower. Perhaps it would then be habitable.

The change of place between Neptune and Uranus should have no effect.

An object like Pluto can probably not exist in the asteroid belt. The influence of Jupiter would break him.
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09 Jan 2017 05:51

What I think would happen is absolutely nothing. Let me explain. Since they are forming in each other's places, the out come would be nearly identical to what we see today
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JackDole
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09 Jan 2017 06:53

I'm assuming that Mars, if it were at the position of Venus, would have a 24.6 hour as today. In any case, since it is smaller than Venus, it would probably have been missed by the object that has slowed Venus.

And Venus has either a 243-day rotation like today, because the object that hit it also changed its orbit, or it was not hit there, and therefore today would have a completely different day's rhythm. In any case, it would make a significant difference.
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09 Jan 2017 14:38

Since they are forming in each other's places, the out come would be nearly identical to what we see today
That is most probably not true.  Gravitational perturbation would be quite different, especially over long periods of time.
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09 Jan 2017 16:40

Can someone make this system?
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Banana
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23 Jan 2017 22:08

But what would happen if Mars and Venus suddenly switched positions right now?
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23 Jan 2017 22:32

But what would happen if Mars and Venus suddenly switched positions right now?
Mars would get slightly warmer and Venus would still be Venus.
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23 Jan 2017 22:48

Or Venus would look something like this.
scr00021.png
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23 Jan 2017 23:20

That would be unlikely.  Even at the distance to the Sun from the orbit of Mars there is still more than enough thermal energy reaching Venus and the amount of Co2 on Venus to keep the rampant greenhouse effect running.  Simply changing the orbital location won't do much unless it is very far out.
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24 Jan 2017 00:06

Of course, I can not prove this, I am not a physicist. I suspect, however, that the air pressure would drop somewhat, and thereby also the greenhouse effect would be reduced somewhat.
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Watsisname
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24 Jan 2017 05:38

If Venus had started at Mars' location, its subsequent evolution would probably have been very different.  Much is still unknown about how Venus did evolve, but we think it started out a lot like Earth, with oceans and a strong greenhouse atmosphere. The main problem was not so much that the proximity to the Sun made it too hot, but that the intensity of the sunlight dissociated water vapor (into hydrogen and oxygen, and the hydrogen escapes) too quickly, so Venus dried out.  Then, without oceans for a tectonic or rock weathering cycle, feedback effects could spiral out of control, and thus the runaway greenhouse.
 
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24 Jan 2017 09:01

Of course, I can not prove this, I am not a physicist. I suspect, however, that the air pressure would drop somewhat, and thereby also the greenhouse effect would be reduced somewhat.
It depends on what you mean with "switching orbit", if it means "slowly changing orbit to reach the new one" or "immediately changing orbit" then I think the current conditions of Venus would last for a lot of time, and we wouldn't probably be able to see the changes within our lifespan.
Still, after some thermal energy have been dissipated, I guess some components of the atmosphere will slowly start to cool down and eventually drop on the surface as ice and the air pressure will decrease. :)
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Watsisname
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25 Jan 2017 02:25

If Venus were moved to Mars (let's imagine immediately) then it would lose energy (initially) at a rate of about 60 petawatts.  Which sounds like a lot, but that's only 0.1 milliwatts per kilogram of atmosphere.  So if this energy loss were only manifest as a change in temperature (which is somewhat wrong), and assuming the change were uniform through the whole atmosphere (which is very wrong), then the temperature would drop at a rate of 2x10[sup]-7[/sup] Kelvin per second, or about 6 Kelvin per year.  Surprisingly slow -- but Venus has a very massive atmosphere, so it takes a long time to cool down.

We could do the same calculation for moving Earth to Mars, in which case it would cool by about one Kelvin per day.  A lot faster, despite being a smaller change in distance from the Sun!

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