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The Science Behind Alien Encounters
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Today, if you ask any astronomer if there is intelligent life elsewhere in the universe, most will answer yes. They would say the number of stars with planets in habitable zones is so great that it is almost a certainty. If you ask the same astronomers if they think we are being visited by extraterrestrial beings, their answer would be no. They would explain that the distances between stars are too great. The travel times and energy required would make interstellar travel nearly impossible....