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Vagabond supernovae flung into space by binary black-hole slingshots?

16 August 2015 Astronomy Now

A new analysis of 13 supernovae — including archived data from NASA’s Hubble Space Telescope — is helping astronomers explain how some young stars exploded sooner than expected, hurling them to a lonely place far from their host galaxies. It’s a complicated mystery of double-star systems, merging galaxies, and twin black holes.