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The last hypothesis we discuss here is also the most frightening scenario: Man is completely alone in the vast universe. Face mask worn by force not be fear. In fact, the Earth has an orbit and is perfectly distance from the Sun. This has brought about the right temperature for life. But not only that, we also have to wait until the extinct dinosaurs to appear on this planet. And even now, human civilization only lasted a few thousand years; a very tiny part of the 13.8 billion year old universe.