Just to the cluster's southeast is the spiral galaxy NGC 6946, about a magnitude fainter but roughly the same size, some 10' on the sky. It's best to search these targets out early in the evening ...
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Star's disappearance in Andromeda marks the birth of a black holeIn 2009, astronomers discovered the only other confirmed failed supernova. It was a supergiant red star in NGC 6946, the "Fireworks Galaxy." It's named N6946-BH1 and has about 25 solar masses.
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