The Biggest Celestial Event of the Year Could Happen Tomorrow
... or, well, maybe not for 100,000 years
Sometime this week, you might walk outside in broad daylight, look up at the sky, and see a luminous orb as bright as a full moon. Only it wouldn’t be the moon. It would be something far more explosive: the dazzling aftermath of a cataclysm hundreds of light-years away.
You’d be seeing the light from a supernova—the final, powerful flash of a dying star.
Or … you might see the regular old sky. Supernovas are nearly impossible to predict. But astronomers have recently started discussing the rare possibility with a bit more enthusiasm than usual, thanks to some odd behavior elsewhere in the Milky Way. If the supernova did show up tomorrow, it would be the celestial event of the year, perhaps even the century, leaving a cosmic imprint in the sky for all to see.
In the night sky, the constellation Orion is most well-known for his belt, a row of three luminous stars. For the last few months, though, astronomers around the world have been particularly interested in his right shoulder, the home of a star called Betelgeuse, one of the brightest stars in the sky. Betelgeuse—which, yes, is pronounced like Beetlejuice—has been dimming more than it ever had before. Astronomers have long known that Betelgeuse is aging and, like many old stars, is bound to explode sooner or later. Could this mystery dimming mean that a supernova might be imminent?
The view would be mind-boggling, day or night. The Orion constellation can be seen from nearly everywhere on Earth, which means nearly everyone could see the exploding star. It would easily cut through the artificial-light pollution that prevents 80 percent of the world—and a staggering 99 percent of the United States and Europe—from experiencing a clear view of the night sky.
“At the predicted brightness of a Betelgeuse supernova, you could be standing in the center of the biggest city in the world, and you would certainly see it,†says John Barentine, an astronomer and the director of public policy at the International Dark-Sky Association, a nonprofit that works to mitigate light pollution. “You couldn’t miss it.â€
https://www.theatlan...pernova/605251/