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3He is perfectly safe, so that is not the issue.The problem is that while it is true that the moon has more 3He than on Earth (it actually does not have very much at all, it is simply that we have even less), and it is true that the 3He came from the solar wind, it took billions of years to collect what there is there (the solar wind has very little of anything, which is why it is typically regarded as a near vacuum, but it has just enough that if you stand there for billions of years you might collect a usable amount of something).So, yes, if you put a large satellite up there for millions, or billions of years, you might get something useful; but simply putting up a satellite up there for 5 years will not come back with anything more than you could just about measure with very specialist equipment - certainly not even a minute fraction of anything that would be a useful amount.
Is that a definite? If the satelite was designed to collect it, maybe we could gather more than we expect.
Do we really understand the particles inside the solar wind that well? If nothing else the satellite, I suggest could help us understand it better.
Do we even know the reason why helium 3 has attached to the moon in the first place?
Yes the problem with mining the solar wind directly is that there are only about 1-10 million particles per cubic metre they are moving at about 300 000m/s so you would get 0.3 - 3 trillion particles passing per second per square meter but only about 1 in 10000 of these will be helium 3So you are looking at about a billion helium 3 atoms per square metre per second which sounds a lot, but there are about 200 000 000 000 000 000 000 000 atoms of helium 3 in a gram.So even if you could collect all the helium 3 in a square km of space you would have to wait 200 000 000 seconds or about 6 and a half years to get a gram of the stuff.
Since the huge funnel would also need to be in orbit, it would be a huge satelite.So, rather than have a huge satelite gathering 3He, you have a huge satelite and feeding a second satelite. I don't see how that's better.