A Magnetar Just Woke Up After Three Years of Silence — Universal-Sci

When stars reach the end of their main sequence, they undergo a
gravitational collapse, ejecting their outermost layers in a supernova
explosion. What remains afterward is a dense, spinning core primarily made
up of neutrons (aka. a neutron star), of which only 3000 are known to exist
in the Milky Way Galaxy. An even rarer subset of neutron stars are
magnetars, only two dozen of which are known in our galaxy.
— Read on www.universal-sci.com/headlines/2018/4/12/a-magnetar-just-woke-up-after-three-years-of-silence

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