UFOs and the Fermi Paradox. If someone is out there, then where are they? cover art

UFOs and the Fermi Paradox. If someone is out there, then where are they?

UFOs and the Fermi Paradox. If someone is out there, then where are they?

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Andrew Fraknoi is a professor of astronomy who wonders if we are alone. And if not, where are they?

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