The red supergiant star Betelgeuse is undoubtedly enormous. But it’s shrinking, and astronomers aren’t sure why. Researchers at the University of California at Berkeley have been monitoring the star by aiming the Infrared Spatial Interferometer, atop Mt. Wilson in Southern California, toward the star’s home in the constellation Orion. Since 1993, the Betelgeuse star (pictured … Continue reading "The Curious Case of the Shrinking Star"