AbsoluteXyro writes: According to a Space.com article, NASA scientists have discovered the smallest known black hole, XTE J1650-500. Weighing in at a scant 3.8 solar masses and measuring only 15 miles across, this finding sheds new light on the lower limit of black hole sizes and the critical threshold at which a star will become a black hole upon it's death, rather than a neutron star. XTE J1650-500 beats out the previous record holder, GRO 1655-40, by about 2.5 solar masses.
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