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There is only one, the Sun. But the nearest star to earth other than the sun is Proxima Centauri.

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About 30 years ago, there was a theory that there was a second star, an invisibly-dim brown dwarf, in a highly-elliptical several-million-year orbit around the Sun. This mini-star was named "Nemesis", and the theory was that as Nemesis passed through the Oort Cloud, its gravity would disrupt many of the proto-cometary bodies that we believe may be out there. This would, among other things, explain the periodicity of the mass extinction events that happen every 30 million years or so. Hence, the name "Nemesis".

But the Hubble Space Telescope would have been able to detect it, and the math didn't work out for the periodic extinctions, so most astronomers accept that there is only one star in our solar system; our Sun.

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14y ago

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