I find it so strange that anyone thinks humans could be "alone in the universe." The universe is vast. There are clearly tons of aliens. And if they're developing technology at a similar pace to us, then we're probably all about to meet each other soon. It's going to be bizarre.
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Not to mention the incomprehensible vastness of the universe. Even if some other civilization happened to be at our evolutionary state or beyond, how did its random trajectory generators shoot anything anywhere near us?
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What if the aliens have very long lives? We think 100 years as the upper limit but there’s no reason that’s universal. If so, it seems possible they could visit us.
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Not to get too Trekkie here but these aliens may have technology we can't fathom, spacial worm holes, travelling in the quantum realm, can travel at the speed at light but are immortal or very long spans,etc. We might be just too primitive of a species to be interesting to them.
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Well, you need 5by or so to develop richness in metallic elements, and this planet needed 3by to evolve complex multicellular life, so we're probably not the earliest but I think it's safe to say we're not the latest, I wouldn't say it's unlikely that we're at a cusp...
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within a few 10s-100s my of some sort of flourishing. But there's no practical way to travel between stars on mechanical craft like we travel between continents according to published science. And we can't talk to anyone if we kill our planet in the next 10y.
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It's a bit like the way our ancestors kept walking round the earth - in evolutionary terms it doesn't take long (<10,000 years). It would take a few million to cross the galaxy. That could have happened thousands of times by now.
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Another interesting part is our tiny window of ”easy” discovery. How quickly we went from analog to digital radio communications. There’s this brief blip in time where we were broadcasting out distinguishable analog radio signals that’re now mostly static to an alien observer.
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