On April 21, 1994, astronomers announced “unambiguous proof” of exoplanets, confirming research originally published in 1992. But these first-discovered planets outside our solar system didn’t come in any form scientists had anticipated. Neutron stars are the second densest type of object in the universe outside black holes. They form when a giant star dies andContinue reading “April 21, 1994: The discovery of exoplanets”
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