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Astronomers have detected the most massive neutron star ever, and it almost shouldn't even exist.Neutron stars are the smallest in the universe, with a diameter comparable to the size of a city like Chicago or Atlanta. They are the leftover remnants of supernovae. But they are incredibly dense, with masses bigger than that of our sun. So think of the sun, compressed into a major city.In the case of the newly detected neutron star, dubbed J0740+6620, it's 333,000 times the mass of the Earth and 2.17 times the mass of the sun. But the star is only about 15 miles across. It's 4,600 light-years from Earth.This is close to the limit of how much mass a compact object can contain before it crushes itself into a black hole.The neutron star itself is rapidly spinning, which is called a pulsar because they send out beams of radio waves from each magnetic pole. The beams mimic the sweeping motion of a lighthouse beam, hence the name "pulsar."Pulsars act like atomic clocks because they regularly pulse, so astronomers can use them to study space and time.The star was detected by the 1098

California Gov. Gavin Newsom signed a bill Monday aimed at tightening standards for when police will be allowed to use deadly force. The legislation will give the state one of the toughest use-of-force standards in the country, 240

California Attorney General Xavier Becerra and Massachusetts Attorney General Maura Healey, along with 18 other state attorneys general, announced a lawsuit Monday challenging the Trump administration's new rule to hold migrant families in detention indefinitely."This new Trump rule callously puts at risk the safety and well-being of children. It undermines a decades-old agreement reached in court by the federal government to prevent the unlawful detention of immigrant children," Becerra 505

Auslaut. Erysipelas. Bougainvillea. Pendeloque.We'd challenge you to have even heard of some of the words, let alone spell them. But they're just some of the words that the eight winners of the Scripps National Spelling Bee conquered late Thursday to be 266

Buck Henry, an actor, director, comedian and writer who was nominated for two Academy Awards, died on Wednesday at the age of 89, 142