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The best possible answer is we don't know.

Just a decade or so ago, astrophysicists believed that no other stars have planets. The first exoplanet discovered was Gamma Cephei b, in 1988. While its existence was questioned for more than a decade, it was finally proven in 2003.

There are currently 840 Planets around 655 Stars, 128 of these are in systems with multiple planets; there are 2,712 Kepler candidates, and 2,756,217 Transit Survey Light Curves that could prove to be exoplanets as well.

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12y ago

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