But where did it come from and why is it in such a hurry to leave? Astronomers using the 3.9-meter Anglo-Australian Telescope at the Australian National University's Siding Spring Observatory discovered the star and conducted follow-up measurements to track its path.
The astronomers were looking for the remains of small galaxies that orbit the Milky Way. The telescope they were using can measure about 400 targets at a time. Instead, they found a star on the outskirts of the galaxy that had been kicked there by the supermassive black hole at the center. The black hole is known as Sagittarius A* or Sgr A*. The black hole is 4.2 million times more massive than our sun.
The star is 29,000 light-years away from Earth and it was kicked away by the black hole about five million years ago. Mackey said there are a number of known"hyper velocity stars" like this one, but special features set the newly observed star apart.
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