You’ve heard what a black hole sounds like, now see what it’s like traveling to one located 1,000 light-years from Earth. This region of spacetime where gravity is so strong that nothing can escape was discovered in a system called HR 6819. It appears through a telescope as a single bright star, but inspecting the light emitted previously revealed there to be two stars present.
Currently, there have been no detected black holes that have been smaller than five solar masses. The HR 6819 black hole just might break that record, but it has yet to be confirmed. However, researchers did determine the viability of searching for black holes by looking for stars that move strangely. Currently, there are less than 50 stellar mass black holes detected in the Milky Way that have been spotted when they flare with the intense heat and light generated as matter is sucked into them.
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On the one branch of the mobile you have two stars hanging, one of which is not visible, which is black – that is the black hole. And these two objects are orbiting each other. And the other branch of the mobile you have one star which is much farther away from the other two. The hallmark of this black hole is that it is truly black. Almost all the other black holes that we know are in the Milky Way – and there are only two dozen of them – shine very brightly in X-rays,” said Dietrich Baade, an emeritus astronomer at European Southern Observatory (ESO).
