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What is the smallest star in the universe?

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OTS 44 a brown dwarf 550 light years away in the constellation Chamaeleon. It has a mass of 0.013 solar masses, about 15 times that of Jupiter, or about 1.5 % that of the Sun. Its radius is about 20% of the Sun.

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Gliese 623b by comparison is 0.080 solar mass
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