Mysteries ofMysteries ofUltraluminous X-raySourceshelium star companions.Examining neutron stars and theirSolar and Stellar AstrophysicsIlluminating the Universe: Ultraluminous X-ray SourcesScientists investigate ultraluminous X-ray sources and their fascinating companion stars.2025-05-31T06:08:12+00:00 ― 5 min read