Betelgeuse, a red giant in the constellation Orion, is normally one of the 10 brightest stars in the sky. For those navigating by sextant, it is one of the 58 navigational stars. Recently, however, it has begun to dim and is now fainter than ever recorded. What is happening?
Jonathan Corum writes in the New York Times: Betelgeuse typically fades and brightens in short cycles of 14 months and longer cycles of about six years. Overlapping cycles might explain the dimming, or clouds of debris might be obscuring the starlight. Or the star might be about to explode. …