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Earth is the only place known by human beings to harbor life in the observed universe, while the sheer number of galaxies make it seem probable that …

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Earth is the only place known by human beings to harbor life in the observed universe, while the sheer number of galaxies make it seem probable that life has arisen somewhere else in the Universe. According to current theories of physics, space travel over such vast distances would take an incredibly long time. What if that had already happened and we were only just beginning to take notice.

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