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A Black Hole Threw a Star Out of the Milky Way Galaxy

Published by Slashdot on Mon, 18 Nov 2019


There are fastballs, and then there are cosmic fastballs. Now it seems that the strongest arm in our galaxy might belong to a supermassive black hole that lives smack in the middle of the Milky Way. From a report: Astronomers recently discovered a star whizzing out of the center of our galaxy at the seriously blinding speed of four million miles an hour. The star, which goes by the typically inscrutable name S5-HVS1, is currently about 29,000 light-years from Earth, streaking through the Grus, or Crane, constellation in the southern sky. It is headed for the darkest, loneliest depths of intergalactic space. The runaway star was spotted by an international team of astronomers led by Ting Li of the Carnegie Observatories. They were using a telescope in Australia for a study known as the Southern Stellar Stream Spectroscopic Survey -- the S5. The star is about twice as massive as our own sun and ten times more luminous, according to Dr. Li. Drawing on data from the European Space Agency's Gaia spacecraft, which has charted the positions and motions of some 1.3 billion stars in the Milky Way, the astronomers traced the streaking star back to the galactic center. That is the home of a black hole known as Sagittarius A*, a gravitational monster with the mass of four million suns.Read more of this story at Slashdot.
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