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Fastest star takes four years to travel around the black hole at the centre of our galaxy, says study
The discovery sheds new light on the origin and evolution of the orbit of fast-moving stars in the heart of the Milky Way.
Updated : Jul 10, 2022, 03:51 PM IST | Edited by : Parul Sharma
 "Fastest star takes four years to travel around the black hole at the centre of our galaxy, says study")
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According to a new study, it takes only four years for a newly discovered star to take a complete round around the black hole at the centre of our galaxy. In the vicinity of the black hole at the centre of our galaxy is a densely packed cluster of stars. This cluster, called the S cluster, is home to well over a hundred stars that differ in their brightness and mass. S stars move particularly fast.
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‘One prominent member, S2, behaves like a large person sitting in front of you in a movie theatre: it blocks your view of what’s important,’ said Dr Florian Peissker, lead author of the new study. ‘The view into the centre of our galaxy is therefore often obscured by S2.
However, in brief moments we can observe the surroundings of the central black hole. ’By means of continuously refining methods of analysis, together with observations covering almost twenty years, the scientist now identified without a doubt a star that travels around the central supermassive black hole in just four years. A total of five telescopes observed the star, with four of these five being combined into one large telescope to allow even more accurate and detailed observations. ‘For a star to be in a stable orbit so close and fast in the vicinity of a supermassive black hole was completely unexpected and marks the limit that can be observed with traditional telescopes,’ said Peissker.
Moreover, the discovery sheds new light on the origin and evolution of the orbit of fast-moving stars in the heart of the Milky Way. ‘The short-period, compact orbit of S4716 is quite puzzling,’ Michael Zajacek, an astrophysicist at Masaryk University in Brno who was involved in the study, said. ‘Stars cannot form so easily near the black hole. S4716 had to move inwards, for example by approaching other stars and objects in the S cluster, which caused its orbit to shrink significantly’, he added.
