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And this is VA3KX. And the last one here for tonight is, where are all the extraterrestrials? And I always like to include something in the ScienceNet each week about extraterrestrials, even theories of where they could be, why they're not here, why they're not visiting, etc. Well, in the 1950s and even going further again in the 1970s, physicist Enrico Fermi and there was another one, Michael Hard, they came up with this recent argument that any sufficiently motivated extraterrestrials would have had adequate time to explore all the worlds in the Milky Way. And the reason that the fact we see no evidence of alien civilization just forms the basis of the Fermi-Hart paradox, in that if there's so many aliens out there, they've had time to reproduce and travel all through the solar system or through the galaxy, and if they were around longer than we've been here, then why aren't we seeing them? Or at least some telltale signs that they're out there.