What if you could slam Mars & Venus with a 100 or more gigantic water rich comets?

[Bad Ronald]

Let's say you could replicate the solar system & do what you liked with the clone?

I'm wondering, if you could do that, & then engaged in the Comet Experiment, what would be the outcome of the cometary impacts for Venus & Mars?

In my situation, a minimum of 100 huge especially water rich comets would be pulled from the Outer Outer Solar System & directed to slam into Mars & Venus. All 200+ comets in all would hit Venus & Mars at the same time, & each set of 100+ comets would hit their respective planetary target simultaneously.

When the dust finally settled what would be the results & outcome on, to, for Mars & Venus?

[WayneFrancis]

well I'd imagine Mars would heat up a fair bit, Venus.....bit of H2O in the atmosphere? oh...and a bunch of craters on mars...and probably Venus depending on the size and makeup of the comets.

[korjik]

over a billion years? No change.

On the short scale, you should have an at least partly habitable Mars. Dropping enough comets would allow a decent atmo, and if there was enough greenhouse effect, liquid water. It wouldnt last all that long geologically speaking, but that is still quite a while.

Venus would be a different problem. Even if you hit it with something that took off most of the current atmo, the sun would probably evaporate any oceans pretty quickly. The very slow rotation is the biggest problem there.

If you really want better real estate in the solar system, move Venus to Martian orbit, then hit it with Mars in such a way to leave it with a 24 hr-ish day and a big moon. Then drop the comets on top. Just remember to get an umbrella for the Earth

[Githyanki]

If you really want better real estate in the solar system, move Venus to Martian orbit, then hit it with Mars in such a way to leave it with a 24 hr-ish day and a big moon. Then drop the comets on top. Just remember to get an umbrella for the Earth

It would take millions of years before Venus, or Earth 2 as it would probably have the same gravity and mass as Earth, would be able to have liquid water.

[WayneFrancis]

It would take millions of years before Venus, or Earth 2 as it would probably have the same gravity and mass as Earth, would be able to have liquid water.

I'm confused on what you mean ... why do you think Venus's mass would not support liquid water? Venus's surface gravity isn't much different then Earth's. The only thing stopping Mars from having liquid water is its thin atmosphere.

[korjik]

I think the liquefied rock that would be the crust of Venus would be the problem. I did hit it with a planet after all.

[Githyanki]

The heat from the impact would take millions of years to cool off before the surface was solid again.

[Van Rijn]

Let's say you could replicate the solar system & do what you liked with the clone?

I'm wondering, if you could do that, & then engaged in the Comet Experiment, what would be the outcome of the cometary impacts for Venus & Mars?

In my situation, a minimum of 100 huge especially water rich comets would be pulled from the Outer Outer Solar System & directed to slam into Mars & Venus. All 200+ comets in all would hit Venus & Mars at the same time, & each set of 100+ comets would hit their respective planetary target simultaneously.

When the dust finally settled what would be the results & outcome on, to, for Mars & Venus?

Mars: There would be a hundred or so warm craters for awhile. Mars might have a net loss of atmosphere (large or fast impacts would tend to cause impact erosion).

Venus: There would be more water vapor in the atmosphere, and there might be a resurfacing event. The surface conditions might get worse for awhile. Venus wouldn't lose atmosphere (Venus has too much mass for efficient impact erosion).

[crosscountry]

I'm confused on what you mean ... why do you think Venus's mass would not support liquid water? Venus's surface gravity isn't much different then Earth's. The only thing stopping Mars from having liquid water is its thin atmosphere.

It is the 700 degree surface temperature that makes Venus oceans impossible, not the gravity.

check this out http://robbwolf.com/wp/wp-content/up...se-diagram.jpg
no where does liquid water exist at 700 C

[WayneFrancis]

It is the 700 degree surface temperature that makes Venus oceans impossible, not the gravity.

check this out http://robbwolf.com/wp/wp-content/up...se-diagram.jpg
no where does liquid water exist at 700 C

I know that but that isn't what Githyanki said and I asked him/her to clarify what they meant.