Comment on xkcd #2978: Stranded
Hamartiogonic@sopuli.xyz 2 months agoHumans are very picky. Must have certain amount of gravity, need to see green stuff, can’t handle radiation etc. it’s is if they were built to be on a specific planet and nowhere else.
Cocodapuf@lemmy.world 2 months ago
You’re totally right, but that gravity, that green stuff, neither of those are on Mars. In orbit at least you get the gravity, rotating habitats aren’t that much more complicated than static ones.
MentallyExhausted@reddthat.com 2 months ago
The presence of water is nice
Cocodapuf@lemmy.world 2 months ago
That’s true. Local water, even as trace ice crystals, would be easier to harvest than chipping apart a comet in deep zero g. But ultimately, your materials for both construction and life support are going to have to start coming from space, and asteroids and comets are the obvious choice.
The best strategy would probably be to send a relatively small vehicle to the comet (small relative to the comet), something like the power and propulsion core for the new lunar gateway, essentially just a big ion thruster with a bunch of solar panels. This can push the comet into an orbit that swings it by the moon to capture it into an earth orbit. You may need to do some earth flybys to lower the comet’s orbit first, so the mission could take years. But to make up for that, comets are huge, and after it’s done you have a source of many different materials to work with right here in earth orbit, enough material to last decades or more.
zabadoh@ani.social 2 months ago
But not all water is useful.
We have a lot of non useful water on Earth in the oceans that has too much salt.
Water from non-Earth sources might contain dissolved minerals at poisonous levels for agriculture, much less human consumption.
And if there’s liquid water from a non-Earth setting, there might be some kind of unknown exo-organisms living in it.
Hamartiogonic@sopuli.xyz 2 months ago
I think we could send robot farmers there to grow some food for the people living in orbit. Maybe low-G carrots could be nicer than the ones grown on earth.
Cocodapuf@lemmy.world 2 months ago
Entirely possible. But hey, in a space station you could have a separate agriculture ring, it may turn out that plants grow most efficiently at some particular amount of gravity, having its own ring would let you experiment, to maximize yield. Also you can use shades and mirrors to precisely control the amount of sun the plants get, even provide them constant sun if that speeds up growth.