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Gravitational waves reveal lightest black hole ever observed

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www.sciencemag.org

Adrian ChoGravitational wave detectors have spotted a cosmic collision in which a giant black hole swallowed up a mystery object seemingly too heavy to be a neutron star, but too light to be a black hole.

Weighing in at 2.6 times the mass of the Sun, the object falls into a hypothetical “mass gap,” a desert between the heaviest neutron star and the lightest black hole that some theories predict—suggesting the gap doesn’t exist and that those theories need to be amended.“People who thought there was a mass gap will have to rethink it, for sure,” says Cole Miller, an astrophysicist at the University of Maryland, College Park, who was not involved in the observation.

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