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NASA scientists have identified the smallest black hole ever found -- less than four times the mass of our sun and about the size of a large city.
"This black hole is really pushing the limits. For many years astronomers have wanted to know the smallest possible size of a black hole, and this little guy is a big step toward answering that question," Nikolai Shaposhnikov of NASA's Goddard Space Flight Center in Greenbelt, Maryland, said in a statement.