“Where is everybody?” – Enrico Fermi.The Drake equation suggests that there are many technologically advanced civilisation in our galaxy. But if they do exist, where are they? Why have they not come to Earth? Why do we see no sign of them? No radio messages, no von Neumann probes, so sign of Dyson spheres.There is no reason to think there is anything unusual about Earth or about our solar system. Exoplanets...
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