A signal from space first detected Aug. 14, 2019, may have come from a mystery object. And it might force physicists to rip up an old idea about black holes and neutron stars.

The signal was a gravitational wave, a ripple in space-time labeled GW190814, and seemed to indicate the collision of two wildly mismatched objects. The larger one was definitely a black hole, about 23 times the mass of our sun. And the smaller one was either a black hole or a neutron star, about 2.6 times the mass of our sun. There’s just one problem: There’s never been evidence that black holes or neutron stars of that size even existed.



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