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Other Issues Discuss other areas of moral and worldly importance that other forum areas do not cover.

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  #41 (permalink)  
Old 07-08-2008, 02:47 AM
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Originally Posted by Jojo View Post
There does appear to be ice - the main problem is lack of atmosphere. I suspect the first step would be the type of lichens that live in arctic tundra - that would make use of the ice, begin an atmosphere, and stabilize soil. I think terraforming would take a looong time - but colonizing, using bubble biomes, would probably be doable far more quickly.
Yes, but the object is to eventually not need the bubbles. They are great for starting, but are not good long term solutions.

The problem is that on Mars, the planet is too light to be able to hold O2 or H2O in the form of gas.
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Old 07-08-2008, 07:02 AM
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Originally Posted by Oregon Elephant View Post
Yes, but the object is to eventually not need the bubbles. They are great for starting, but are not good long term solutions.

The problem is that on Mars, the planet is too light to be able to hold O2 or H2O in the form of gas.

Is this the gravity because it's smaller? It will make it tricky to terraform. Like you, I suspect one of jupiter's moons will be the best place to colonize - but I can't see venus being easier than mars. Even with raw materials in the atmosphere - the heat would just be too far beyond us to manage.
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Old 07-08-2008, 11:51 AM
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Without's it extremely heavy atmosphere, Venus would not be that much hotter than Earth, probably about 30 to 50 degrees warmer on the celcuis scale. The atmosphere is only so thick, not because of the mass of the planet, but because the gas that makes up the atmoshpere (CO2) is so heavy.
30 Celsius?! That's quite a bit hotter than Earth...
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Old 07-08-2008, 02:47 PM
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30 Celsius?! That's quite a bit hotter than Earth...
Not compared to the 300 Celsius that it is already over Earth. An increase of 30 degrees celsius would only increase 54 degrees F, so at latitudes of like 60 N, they would have a warm summer average of about 120 F and winter averages of about 110 F (Venus has hardly any tilt on it's axis).

The two biggest obsticles to overcome with Venus is the heating of it's core (which would cause it to start spinning, allowing the magnetic field to turn back on and to cause the planet to also spin faster, conservation of angular momentum) and working under the pressure (not the heat). The pressure is so great that it would crush our submarines, which are designed to survive under the pressures of the deep oceans.
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Old 07-09-2008, 11:27 PM
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i read a sci fi short story once about a colonising mission to other stars. it was a large ship designed to travel through real space at speed close to light. the mission was to take about 50 years. when they got there the descendants of the original crew were the majority with only a few original earth born people left.

but the mission never happened. the ship born crew had no interest in colonising. they had spent their whole life on the ship and had no desire to make a planetary colony. they used the colonising technology to land and stay only long enough to build another ship, then they left the place and continued travelling.
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Old 07-10-2008, 12:15 AM
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Old 07-10-2008, 01:05 AM
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i read a sci fi short story once about a colonising mission to other stars. it was a large ship designed to travel through real space at speed close to light. the mission was to take about 50 years. when they got there the descendants of the original crew were the majority with only a few original earth born people left.

but the mission never happened. the ship born crew had no interest in colonising. they had spent their whole life on the ship and had no desire to make a planetary colony. they used the colonising technology to land and stay only long enough to build another ship, then they left the place and continued travelling.
Or the story where the crew of a fast ship is supposed to make a many-year journey to a new planet, but when they get there they find out it has already been colonized by people who built a faster ship on earth while they were away.
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  #48 (permalink)  
Old 07-10-2008, 02:04 AM
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That reminds mo of Wall-E (the new Pixar movie), only they are in outer space waiting for the robots to clean up their mess, than they are going to return.
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Old 07-10-2008, 10:55 PM
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The problem is that on Mars, the planet is too light to be able to hold O2 or H2O in the form of gas.
No, the Mar's problem is that its core is solid, meaning it has no magnetic field. The atmosphere existed there before but it got blown away by solar wind. The moon is not massive enough for an atmosphere.
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Old 07-11-2008, 12:40 AM
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No, the Mar's problem is that its core is solid, meaning it has no magnetic field. The atmosphere existed there before but it got blown away by solar wind. The moon is not massive enough for an atmosphere.
You mean completely solid (no liquid outer shell, or mantle, we have a solid core too, but it sits in liquid so it can spin) if we restart the core (like we would plan on doing for Venus) conservation of angular momentum would mean that the planet would either start spinning faster (shorter days and nights), or longer (depending on which way we got it to spin). If it spins faster than the centerfugal force would cause the atmosphere to have an even harder time trying to stay on.

The magnetic field actually has little to do with atmoshpere. Venus has no magnetic field (it's core has also stopped spinning) and it is closer to the sun, meaning that it experiences and even stronger solar wind than Mars, yet it's atmosphere is 80 times heavier than ours. That is because of it's extremely slow spin (1 Venus day = 243 Earth days), it doesn't have the centerfugal force flinging the atmosphere away.
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