Mystery object blotted out a giant star for 200 days

Something huge and opaque caused a star in our galaxy to dim, and astronomers are struggling to explain the phenomenon.

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An artist’s impression shows the star VVV-WIT-08, which mysteriously disappeared during the first half of 2012.

Stars may twinkle, but they don’t just vanish—so when a distant, giant star pulled a disappearing act for about 200 days, it took astronomers by surprise.

Now, roughly a decade later, astronomers have sifted through a variety of possible explanations—and they still have no idea what’s responsible for blotting out nearly all of the star’s light.

Described in a new study in the Monthly Notices of the Royal Astronomical Society, some of the theories still on the table rely on as-yet unobserved phenomena, such as a dark disk of material orbiting a nearby black hole, or undiscovered, dust-enshrouded companion stars. But over 17 years of observations, the star has only gone dark once, in 2012, making it more difficult for teams to nail down a plausible culprit.

It’s clear that whatever object eclipsed the distant star is huge—much bigger than the star itself. It also appeared to be completely opaque, blocking much of the starlight entirely, and it seemed to have a hard edge.

“The degree of drop in brightness is really impressive,” says Emily Levesque of the University of...

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