The black hole itself cannot be seen because it does not allow light to escape. But the presence of a second star indicates the existence of the black hole. Scientists can see how the star's dust is “engulfed”, causing changes in its brightness.
So-called double stars are more common, but it is rare for one star to survive the explosion of the other. The second star and the rest of the first star may now be orbiting each other. Eventually, the black hole will swallow the second star entirely.
Scientists believe that most galaxies revolve around a black hole. For example, the Milky Way galaxy, which contains the solar system along with Earth, orbits the supermassive black hole Sagittarius A*.
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