The smallest star found with the Hubble Telescope is known as Gliese 623b. It is ten times smaller than our Sun and 60,000 times fainter. It is 25 lightyears away from Earth.
If you count black holes as stars, I would nominate the black hole as the smallest known star. A black hole is basically a star that has collapsed into itself and become so massive that not even gravity can escape. Some black holes called “stellar-mass” black holes can be as small as 30 km across. Scientists predict that there are also “micro” black holes which might be as small as 0.1 mm, although they are only theoretical predictions and we can’t say for certain that they actually exist.
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