A hidden star is plowing through Betelgeuse’s atmosphere, new evidence suggests

Something unusual is happening inside the enormous atmosphere of Betelgeuse, one of the most recognizable stars in the night sky. Astronomers have detected subtle changes in the star's shape that suggest something is moving through its outer layers, disturbing the surrounding gas like an unseen visitor making noise inside a house. (Metaphorically speaking.) New observations point to a likely culprit: Siwarha, a recently discovered companion star that appears to be traveling through...