This would explain a lot and makes sense in explaining why some supernovas may not reside where you might expect:

Rogue supernovas that explode all alone in deep space present an astronomical mystery. Where did they come from? How did they get there? The likely answer: a binary black hole slingshot, according to a new study by Ryan Foley, a professor of astronomy and physics at the University of Illinois.

Foley set out to solve the puzzle of a rare, strange type of supernova found far from any galaxies or star clusters. The supernovas are known as calcium-rich because they produce an unusually large amount of calcium.

Let’s find out more on this theory and check out a supernova video on page 2

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