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The focus was a binary star system called XTE J1550-564. The star system lies within the Milky Way galaxy, but it is still 17,000 light-years from Earth. (A light-year is the distance that light travels in one year, at the rate of 186,282 miles per second.)
In this star system, a normal star orbits an older, collapsed star.
As the younger star's gases are pulled toward the black hole, they form a spinning disk, like water being sucked into a drain.