Astronomers have found evidence for a Star that whips around a black hole about twice an hour. This may be the tightest orbital dance ever witnessed for a black hole and a companion star. An artist's impression of a white dwarf star (left) in orbit around a black hole and so close that much of its material  is being pulled away. Inset is an observation of the host globular cluster, 47 Tucanae, captured by NASA's...

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