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5 Cosmic Mysteries That Scientists Still Hope to Solve - National Geographic
http://news.nationalgeographic.com/2016/02/160218-dark-energy-matter-universe-gravity-mysteries-space/Perhaps extraterrestrials are treating Earth as a wilderness area. Or maybe evolution contains a “Great Filter” that nips spacefaring civilizations in the bud. Some scientists and philosophers have even argued that biological life is transitory, and ...
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