wikipedia timeline of future superficially confirms but not sure i've taken everything relevant into account
Can you spell this one out a little more? We seem young and alone, so if we're typical then either our hidden-from-each-other civilizations have short lives or they have short memories. Is that it?
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if "my hypothesis predicts more civilizations so it's more likely" is good reasoning then it should work for time too
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depending on how many 21st century like civilizations you can cram into history of earth and how unlikely that state of affairs is ofc
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