NASA’s Hubble Sees Huge Gaseous Halo around Andromeda Galaxy

Astronomers using the Cosmic Origins Spectrograph (COS) on the NASA/ESA Hubble Space Telescope have discovered that a nearly invisible halo of hot plasma surrounding the Andromeda Galaxy is 6 times larger and 1,000 times more massive than previously measured. The Andromeda Galaxy, also known as NGC 224, Messier 31 or M31, is a spiral galaxy [...] —> Read More