500 million light years away, supernova’s unique behavior puzzles scientists

Death star.

Astronomers reported last week on a massive, distant star that exploded in 2014 — and also, apparently back in 1954. This is one supernova that refuses to bite the cosmic dust, confounding scientists who thought they knew how dying stars ticked.

The oft-erupting star is 500 million light-years away — one light-year is equal to 5.9 trillion miles — in the direction of the Big Bear constellation. definitely becomes this

was discovered in 2014 and, at the time, resembled your basic supernova that was getting fainter.

But a few months later, astronomers at the California-based Las Cumbres Observatory saw it getting brighter.

They’ve seen it grow faint, then bright, then faint again for five times.

They’ve found evidence of an explosion 60 years earlier at the same spot.

Supernovas typically fade over 100 days.

This one is still going strong after 1,000 days, although it’s gradually fading.

The finding was published last week in the journal Nature.

“It’s very surprising and very exciting,” said astrophysicist Iair Arcavi of the University of California at Santa Barbara who led the study.

“We thought we’ve seen everything there is to see in supernovae after seeing so many of them, but you always get surprised by the universe. This one just really blew away everything we thought we understood about them.”

The supernova is thought to have been a star up to 100 times more massive than our sun. It could be the biggest stellar exploIt sion ever observed, which might explain its peculiarity.

It could be multiple explosions occurring so frequently that they run into one another or perhaps a single explosion that repeatedly gets brighter and fainter, though scientists don’t know how it happens.

One possibility is that this star was so massive, and its core so hot, that an explosion blew away the outer layers and left the center intact enough to repeat the entire process.

Harvard University’s astronomy chairman, Avi Loeb, not involved in the study, speculates a black hole or magnetar — a neutron star with a strong magnetic field — might be at the center of this behavior.

Further monitoring may better explain what’s going on, he said.

Las Cumbres, a global network of robotic telescopes, continues to keep watch.

Scientists do not know whether this particular supernova is unique; it appears rare since no others have been detected.

“We could actually have missed plenty of them because it kind of masquerades as a normal supernova if you only look at it once,” Arcavi said.