Odd behavior of star reveals lonely black hole hiding in giant star cluster

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Odd behavior of star reveals lonely black hole hiding in giant star cluster

(ESO) Astronomers using ESO’s MUSE instrument on the Very Large Telescope in Chile have discovered a star in the cluster NGC 3201 that is behaving very strangely. It appears to be orbiting an invisible black hole with about four times the mass of the sun — the first such inactive stellar-mass black hole found in a globular cluster and the first found by directly detecting its gravitational pull.

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