/sci/ - Science & Math

>>11314291
Mars' specs:
• Gravity (g): 0.377g (37.7% of Earth's 1g)
• Atmospheric Pressure (AP): 0.636 kPa (0.62% of Earth's 101.325 kPa AP at sea level and 1.88% of Mount Everest's 33.7kPa AP)
• Radiation: 0.2 to 0.3 Sv per year (97-98% more than Earth's average of 6.2 mSv/0.0062 Sv per year.)
• Solar Radiance: 590 W/m^2 (59% of Earth's 1000 W/m^2)

Mount Everest's peak has an altitude of 29,029 feet (5.497 miles) above global mean sea level on Earth. That is on average 30 kPa. Mars atmosphere pressure is only 0.610 kPa.

>Earth's atmosphere is about 300 miles (480 kilometers) thick, but most of it is within 10 miles (16 km) the surface.
Thus, in a round about way Mount Everest's peak is about a bit more than halfway up into Earth's usable atmosphere. Meaning, there's only about 4.503 miles of atmosphere above it. Let's pretend this is the distance we need for your exercise,

Mars diameter: 4,212.3 miles
Mars volume: 39,100,000,000 cubic miles
Needed atmosphere thickness: 4.503 miles
Mars Dia + Atmosphere thickness = 4216.803 miles
Mars Dia + Atmosphere volume = 39,300,000,000 cubic miles

39,300,000,000 cubic miles - 39,100,000,000 cubic miles = 200,000,000 cubic miles

You need 200,000,000 cubic miles of breathable air to reach Mount Everest level of atmospheric pressure on Mars.
21% of 200,000,000 cubic miles = 42,000,000 cubic miles (68,731,291 megatons) of pure oxygen needed.
79% of 200,000,000 cubic miles = 158,000,000 cubic miles of pure nitrogen needed.

>all calculations are fuck terrible and make wide assumptions and probable have huge mistakes everywhere.

>greenhouses
Not enough light from the sun to do that. Radiation shielding will strip the rest of the light until windows are no longer windows. Use RTGs for energy to power LED grow lights instead.

>release the oxygen created to create the atmosphere
As the above calculations show, you are going to need a shit load of gas to give Mars any kind of remotely usable atmosphere. Plants will not help.

>>11275864
You only need to make space colonies, not planet colonies.

>>11225630
>Any hopes for metamaterials
None at all I'm afraid. Pretty much ever, "'amazing material just around the bend,' researchers say," is just grant farming.

While this image is quite a big meme fest, check out the white section listing specs for celestial bodies and the viable colony section. Ridiculous amounts of radiation shielding aside, there are a few planet possibilities for colonies. Those planets provide nearly 1g, allow normal pressure at floating city altitude, and other than Venus they have high fuel atmospheres for colony use along with being much cooler than frying temps. It'd be easier to heat something up than cool something off after all. Rotations for Saturn/Uranus/Neptune are 10.52 hours for 1 Earth day/17.24 hours for 1 Earth day/>16 hours for 1 Earth day, respectively. Thus, all of those could probably have a sky hook if those things were possible, baring ring interference over all 3 of course. Though, I don't see the need.

The floating city idea comes from the the pressure you mention. A balloon here on earth need to have a gas that has less pressure (lighter than air) than the air you breath right? Well, on Venus, Saturn, Uranus, and Neptune the 101kpa pressure we have here at sea level is actually way up high in the atmospheres of those planets. So, a "balloon" with normal Earth air and normal Earth air pressure could float around that height somewhere. Thus, a floating city that use normal materials to hold itself together. Jupiter also has a gas pressure zone like that, but its gravity at that zone is too much if I recall correctly.

The fear of crashing isn't too much or a problem when using cellular construction where an explosion would only rupture a scant few cells at most. The rest of the structure's cells would still hold everything afloat without much problem if any.

>>10643592
Highly. Because you'd need a shit load of mass. I think the calculations are in this image in the terraform section.

>>10543696
>Terraform Mars

>>10510412
HAHAHAHA

>>10465635
Close solar orbit. Thick shielding, no windows, lots of passive solar steam punk electric generation.

>>10387882
>Mars colony
>Mars terraforming

Pipe Dreams

>>10357206
>>10357189
>>10357195
That is why you need to make some sort of support structure to held it together. Something akin to spraying it with truck bed liner then covering it with metal netting. lol

>>10220674
>Realistic terraforming

You are deluded. There is no such thing at all. It is pure science fiction. You do realize this >>10219904 image is pure satire right? As far as colonies on Mars? Shit dude, you are 200% delusional if you believe that will happen in any shape or form.