I always loved the conceitedness of assuming that UFOs are a sign that aliens live on Earth and are waiting for the right time to make contact, rather than a space Roomba that took a wrong turn at the Moon one day, or road cones in hyperspace falling through a hyperpothole
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We are very close to having the technological level to send out interstellar self-replicating probes, so knowing that the universe is old and having recently discovered that planets are ubiquitous, we should be more open to the idea that odd derelict stuff is all over the place.
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There are two high-probablity hypotheses that I think we really underestimate because of the crackpot factor—panspermia (that life spreads between planets) and that space might be full of rusty old Voyagers
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Like there's bacteria that live in deep rock under the seafloor, whose sex life improves when you centrifuge them at 400,000g (!), ones that are highly radiation resistant, some that can stay dormant for ages; there's bacteria that live in clouds. Seems worth a closer look to me.
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The “roadside picnic” theory
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