Terralthra wrote:Broomstick wrote:Well, sure - and on Mars there is an actual atmosphere even if it's very thin and you could theoretically have a machine that concentrates it to a desirable pressure and changes the gas mixture to something humans can breathe comfortably whereas in a space habitat you have to import all gases instead of simply gathering them from the local environment.
Oxygen and nitrogen are found commonly on asteroids and comets, which can be "gathered from the local environment" too.
Items notably lacking at LaGrange points, so you'd have to either move said comets and asteroids to there, or mine them and then transport the materials to your space habitats. Is that better or worse than mining/gathering on Mars? I don't know - has anyone really done the calculations? We've done mining on a planet before, and while Mars involves some issues with pressurizing spaces for humans involved in the process mining on a planet is a mature and well understood technology. No one has actually mined an asteroid, so there may be problems we haven't foreseen with that.
Terralthra wrote:Space habitats do not lack gravity. They have centrifugal gravity, which they generate by spinning. You can find more information on this if you scroll up and look at posts to which you previously replied. Space habitats have more gravity than Mars, which only has 0.38g. This has already been explained to you.
And as I already explained to you I'd have a lot more confidence in that solution if we had actual experience in building rotating habitats in space. By all means, I'd love to see that technology mature, too.
Terralthra wrote:Broomstick wrote:Uh-huh.... all of which will need maintenance and tending. Some someone is going to be doing the scutwork regardless of whether they're in space or on Mars.
As previously mentioned, and replied to by you, the difference is that a space habitat can have plentiful solar electricity to power machinery to help or do the work for the humans, while on Mars solar power is an order of magnitude less efficient, meaning fewer machines to assist.
As I said - someone is going to be doing scutwork regardless of where you farm. The fact you have more machinery means a higher percentage of the scut involves machinery, that's all. Whether you're talking a habitat in space or on Mars if you're going to have actual, long-term (hopefully) self-sufficient habitats there will have to be dedicated personnel doing what is essentially ditching digging in space.
Terralthra wrote:Broomstick wrote:If you have a personal bias for space habitats that's totally OK, but the obstacles to making them long-term self-sufficient human habitations are daunting, just like setting up a Mars colony is daunting.
At no point have I claimed that there are not daunting obstacles. My claim all along has been that for a smaller or similar amount of infrastructure and work setting them up, space habitats offer a better quality of life, are more efficient at housing humans (which stands to reason, since that's what they're designed to do and Mars is not), and are more expandable.
More expandable? On Mars you have an entire planet to expand across.
As for quality of life - that's debatable. I expect some people would prefer one over the other. Define "house efficiently". Denser living quarters are not inherently better, as one example.
Terralthra wrote:Broomstick wrote:Actually, Mir had a hull puncture and depressurization and while it was certainly serious and classified as an emergency no one was injured by it, either. And the guys up there had to deal with it rather than rely on help from the ground.
Well, by "deal with it", they meant "seal off that area and never use it again". Spektr had its emergency bulkhead closed and it was never repressurized before Mir was deorbited. I don't really count that as fixing the problem.
Sure it does - they stopped the leak and no one died.
Granted that's not an
ideal solution, but if there had been a will to do so the damage module could have been removed and another replace it. No one wanted to spend the money and effort to do so. It's certainly a demonstration that a leak isn't instantly fatal.