Andromeda`s bright X-ray mystery solved by NuSTAR
(PHYSorg.com Space & Earth)

The Milky Way`s close neighbor, Andromeda, features a dominant source of high-energy X-ray emission, but its identity was mysterious until now. As reported in a new study, NASA`s NuSTAR (Nuclear Spectroscopic Telescope Array) mission has pinpointed an object responsible for this high-energy radiation.