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Proxima Centauri is the closest star to the sun , is a red dwarf and is in a trinary star system. Proxima Centauri is 4.22 light years away from earth . In about 9,000 years from now Barnard's Star will move close enough to the sun to become the closest star . Proxima Centauri is about 0.21 light years from its closest neighbors, Alpha Centauri A and B. Proxima Centauri takes about 500,000 years to orbit Alpha Centauri A and B.