A gigantic, particularly-bright star just disappeared without a trace.

It’s an unusual case: The giant star in the nearby Kinman dwarf galaxy, which was 2.5 times brighter than our Sun, had been observed during a decade’s worth of observations, Gizmodo reports. But when astronomers went to check up on it in 2019, the star had vanished.

Thankfully, the Trinity College Dublin astronomers have some ideas for what could have happened.

There are two possibilities that the team threw around in their research, published Tuesday in the journal Monthly Notices of the Royal Astronomical Society. First, the star could have drastically decreased its brightness and is also obscured by a cloud of dust. The second is far more mysterious: It could have died and turned into a black hole without ever exploding in a supernova.

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