Recent comments in /f/space

swishphish1 t1_jd64pzo wrote

A big part of global warming (in this specific sense, keeping the earth at a hospitable temperature for millions of years) is caused by rain clouds, surprisingly enough. Not saying it couldn’t be done with conventional greenhouse gasses (carbon dioxide and methane), but I think it would be better to do it in a natural sense (water vapor). That’s an interesting thought though, and I encourage you to explore it more with your teacher.

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OnlyAstronomyFans t1_jd64lq3 wrote

This is going to be my last response to you because I am positive that you’re trolling us, trying to get karma so you can post spam in other subs that have rules about new accounts posting.

That said but the only reason anyone would do this would be because they wanted themselves and all of their descendants to live on that asteroid forever. You would need insane technology just to get to the interstellar object, let alone land and mine it. For sure it is not anything that would happen in either of our lifetimes. Fairs seas, my little troll.

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Nerull t1_jd646f7 wrote

Not really. For interstellar asteroids you're looking at transit times between star systems measured in millions of years. Nuclear power isn't going to last that long. Frankly, neither is human technology. If people did somehow survive on an asteroid for millions of years, they wouldn't have any cultural memory left of how they got there or why and they would have evolved to be substantially different than humans on Earth - which they might find at their destination anyway, if Earth humans develop faster propulsion methods.

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Nopants21 t1_jd64187 wrote

I think you're imagining a much larger asteroid than what is common. Oumuamua was at most a kilometer long and it was considered a large enough object. Most fly-through objects are much too small to be mined productively and also hold together well enough to act as shielding.

On top of that, the amount of stuff you'd need to mine it is also much larger than you might think. You need refining, production, maintenance, energy, and the rovers you're sending need precision tools to create precision installations. Think of the amount of mining that goes into making a single rocket on Earth, it requires several countries working together for every rocket launch, each with a power grid, an industrial base, a workforce, etc.

As a last point, if the object is going fast enough, staggering your operation so that it's not all in one go makes it so that everything needs to occur in a short timeframe, because the object is zipping out of the solar system pretty quick. By the time you see the object, calculate where it's going, get everything organized, you might have missed it.

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Alvsvar OP t1_jd63wnf wrote

Danm, that was one hell of answer thanks for the info although the units are abstract for me and I can't even remember Avogadro's law . Im probably getting this wrong but does this mean in 22.4 l of empty space there is one hydrogen atom? Thats super interesting how little hydrogen is in an atom, those strong nuclear forces.

The reason Im asking this is I was wondering if you could have a "net" that could collect these and other atoms, for a space ship. I was also interested how much hydrogen was there and how empty it really was. Its so crazy these coalesce into everything that built the universe.

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Brain_Hawk t1_jd63jzf wrote

Asteroids are not typically that large, of course there's exceptions. But the gravity on this supposed intersolar object would be almost definitely miniscule. Finding a very large asteroid passing through the solar system seems to be rare, as far as I am aware, though I admit my knowledge here is very limited

So why would anybody want to live on such an asteroid? It's not going anywhere fast. The nearest star intersection is likely to see will be somewhere in millions of years in the future. So all these people are going to go live on this asteroid which is basically living in outer space with no gravity, which will have all kinds of problems for your body, and now they're cut off from the earth and have to live in a small self-sustained society which is by its very nature going to have extraordinarily strict rules and limit people's personal freedom to be huge degree, limit what you can do what you can see if you can talk to, definitely limit who you can sleep with and how much population you're allowed to grow.

Also that in a few million years maybe it will pass through some of the solar system that may or may not have some useful thing to visit?

Nah. That's not a mission that's going to happen even if it were feasible

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Nerull t1_jd63gc2 wrote

Asteroids are not traveling nearly fast enough to be useful to transit from one place to another.

Realize you're talking about transit times measured in millions of years.

Even at these slow speeds, we basically get one shot to intercept it before its out of reach. There is no time to slowly launch many smaller probes to it, or build up a base on it.

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Brain_Hawk t1_jd637v6 wrote

This is a really good point that didn't occur to me right away, but it's totally true.

At that point the asteroids only helpful if it provides something more. And frankly, the second part release skills it as not worth the time and effort, hop on an asteroid and go... Nowhere

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Majestic_Pitch_1803 t1_jd62vkq wrote

A quick answer would be protection from space debris. More land with which to make the space craft more reinforced and with which to potentially build further technological instruments, or even live on if that was a possibility.

Even so. It could provide avenues for slowing down the payload once reaching the destination. If you could mine for fuel, that’s a win.

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pmMeAllofIt t1_jd5y2e6 wrote

How is the object going in a desired location. The chances of it's trajectory being exactly where we want it to be is unlikely. But even so, we manage to hitch a ride. Oumuamua at it's perihelion was doing 87km/s, but climbing away from the Sun slows it down. From what I see it will average about 26km/s. At that speed it will take 15,000> years to leave the solar system, and about 50,000 years to reach the nearest star.

As crazy as it sounds, it's not fast enough.

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OnlyAstronomyFans t1_jd5xqis wrote

Why wouldn’t you just stay in the ship that you built that already had enough Delta V to escape the system? I see what you’re getting at but why would you want to do it? The thing would be moving so fast you would spend so much energy trying to catch up to it then you’d have the complication of trying to land on it and hope that it fits your needs. All those pictures you saw of those previous interstellar objects were just artists depictions. Nobody could image them well enough to know what they were made of or what their spin rate was, really anything about it, other than its speed and trajectory.

Unless we’re already really good at interstellar travel, what you just described is the suicide of whatever crew was on that ship

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