Suppose a green alien came down to Earth in his big spaceship. Suppose that alien was the alien who brought life on Earth and created humanity. Suppose that alien is a bit dissatisfied with us. So basically God, if you're a christian (only green instead). So, what does he do? He asks us to create a perfect vacuum. "You have a couple of centuries to create a perfect vacuum" he says. "No need for anything fancy, all I care is to have a space at least a tenth of a cubic centimeter that is completely devoid of any atoms, I don't care much about neutrinos and photons and other silly stuff. But it has to remain like that for at least another century, otherwise I'll bring my death beam and kill you all. If you do it, I'll solve world hunger, give you the cure to cancer, tell you the meaning of life and abolish pop up ads". Yes, I know, "We can't create a perfect vacuum, blah blah blah..." but what if we really had to? And what if we could concentrate all of humanity's efforts on that? According to Wikipedia, concentrations of about 100 molecules per cubic centimeter have already been reached. For a space of 1/10cm^3 it gives us about 10 molecules. I know there are probably many problems other than pumping molecules out that should be addressed, such as diffusion, but these can probably be solved. So, can it be done? If yes, how? TL;DR: Make perfect vacuum, how?