GoKawiilALMA imaging shows Betelgeuse's hotspot persisted for at least seven years
New ALMA observations of Betelgeuse, taken in 2023 at record resolution, reveal an uneven, corrugated surface with bright hotspots up to 800 K warmer than the surrounding 2300 K atmosphere. Comparing these images to earlier 2015 ALMA data, astronomers found that a prominent hotspot in the northeast has remained in nearly the same position and brightness for years.