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Our Sun and its twins fled the centre of the Galaxy 4 billion years ago. Otherwise, life may never have emerged on Earth  BBC Sky at Night MagazineThe Sun's Great Escape  Universe TodayThe sun and thousands of its twins migrated across the Milky Way just in time  Scientific American'Mass migration' of stars from the Milky Way's center could explain why there's life in our solar system  Live ScienceOur Sun may have migrated across the Milky Way billions of years ago  Earth.com