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The smallest main sequence star detected so far is called OGLE-TR-122b.

It has a radius of 0.12 that of our Sun which means it is only 20% larger than Jupiter and has a mass of about 100 times that.

Astronomers describe the smallest star as a "core burning star," like our Sun. But prevailing theory never anticipated such a diminutive star, since the standard fusion model of stars required a minimum gravitating mass considerably greater than that of Jupiter.

The smallest non main sequence star is a neutron star with a diameter of 12km - equal to about the length of Manhattan Island from the tip till the end of Central park.

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