One of the Milky Way’s Fastest Stars Is an Invader From Another Galaxy (sciencemag.org)

sciencehabit writes from a report via Science Magazine: On April 25, the European Space Agency released a data set gathered by the Gaia satellite containing the motions, and much more, of 1.3 billion stars. Astronomers have immediately sifted the data for fast-moving stars. They are prized as forensic tools: When rewound, their trajectories point back to the violent events that launched them. Last week, one team reported the discovery of three white dwarfs — the dying embers of sunlike stars — hurtling through the galaxy at thousands of kilometers per second, perhaps flung out from supernovae explosions. Another group reported more than two dozen fast-moving stars, some apparently kicked out by our galaxy’s central black hole. And a third has confirmed that a star blazing through the outskirts of the Milky Way actually hails from another galaxy altogether, the Large Magellanic Cloud. The flood of discoveries has sent astronomers racing to their telescopes to check and classify the swift objects, says Harvard University astronomer James Guillochon. The findings have been reported in the journal Science.

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