What If Aliens Arrived Tomorrow?

Are we alone in the Universe? With more than 100 billion galaxies in the observable Universe and at least 500 billion planets in the Milky Way alone, don’t you think we should have found something by now?

Even if a tiny percentage of those billions of planets hosted intelligent life, there would have to be tens of thousands of extraterrestrial civilizations out there. Yet, we haven’t seen any.

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