Scientists at Ohio State University have, for some time, been watching a galaxy 22 million light-years away. That galaxy, called NGC 6946 and nicknamed the "Fireworks Galaxy," sees a large number of supernovae that scientists observe via the help of the Large Binocular Telescope (LBT).

In 2009, scientists noticed that one star, N6946-BH1, was beginning to weaken. In 2015, it disappeared — no big flash, no epic supernova. The scientists concluded that it had instead become a black hole, something that scientists usually believe can only happen after a supernova. Scientists aptly called this unusual trajectory a "massive fail," and published their results in the Monthly Notices of the Royal Astronomical Society.

"The typical view is that a star can form a black hole only after it goes supernova," said Ohio State astronomy professor and study researcher Christopher Kochanek in the press release. "If a star can fall short of a supernova and still make a black hole, that would help explain why we don't see supernovae from the most massive stars."

Scientists still don't know how often stars go through massive fails, but researcher Scott Adams predicts that it occurs in about 10 to 30 percent of massive stars.

The findings could help explain the origins of very massive black holes, since they may be easier to form if no supernova is necessary. That's because the explosion of the supernova ends up blasting out the star's outer layers, leaving behind less mass to create a black hole. If no supernova was involved, more of the star's mass would be available to transform into a more massive black hole.

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Hear the dramatic story about the discovery of gravitational waves in Janna Levin's "Black Hole Blues and Other Songs from Outer Space." We handpick reading recommendations we think you may like. If you choose to make a purchase, Curiosity will get a share of the sale.