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The Fermi Paradox - Where Are They?
Enrico Fermi first posed the question, where are they? It's because we know how old the universe is and we know how long it would take to colonize a galaxy. You realize that you can completely populate all planets in the galaxy in just a few million years. Earth has been around for four and a half billion, billion years. If there were other planets that were formed before Earth was a billion years before Earth,. We formed seven, eight billion years after the universe formed.