National Geographic: A giant star is acting strange, and astronomers are buzzing. “The red giant Betelgeuse is the dimmest seen in years, prompting some speculation that the star is about to explode. Here’s what we know.”
“[Villanova University’s Edward] Guinan suspects that Betelgeuse is dramatically dimmer now because two of its cycles are overlapping at minimal brightness. In essence, the star is approaching the dimmest points in both its six-year and 425-day cycles, an intersection that makes the star’s normal fluctuations appear much more sinister. After looking through 25 years’ worth of prior data, Guinan suspects that the star will continue to fade for another couple of weeks before gradually turning back on.
But, he says, “if it keeps getting fainter, then all bets are off.””
Link via Garret.