Hypersoft X-ray Sources Discovered in Nearby Galaxies

Researchers identify 84 unique X-ray sources offering insights into supernova and cosmic medium mysteries.

Scientists have identified 84 hypersoft X-ray sources in galaxies including M101 and Messier 31, along with four elliptical galaxies. These unusual objects emit very low-energy X-rays and are believed to release significant ultraviolet light. Their discovery may provide answers to longstanding questions about Type Ia supernova explosions and the nature of the intergalactic medium. An image of galaxy M101, showcasing these findings, was made public on September 9, 2026.