Plate Tectonics And CO2 On Planets Suggest Alien Civilizations “Are Probably Pretty Rare”Earth is pretty special, and as far as we know, the only place in the universe with life. But how special is it really? There are billions upon billions of planets in the Milky Way alone; shouldn’t life be common? Maybe, but even if life is common, how common are advanced civilizations? Some new work argues...
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