Astronomers have taken the closest look yet at X-4, one of the ultraluminous X-ray sources in the Whale galaxy, and found ...
The emission of X-rays is usually the domain of the energetic events of the universe: hot stars, supermassive black holes, and the like. However, since 1996, with Comet Hyakutake, we have learned that ...
Using ESA's XMM-Newton satellite and NASA's Chandra X-ray observatory, astronomers have observed a young stellar object known as HL Tauri. Results of the observation campaign, presented Feb. 11 on the ...