Sky's Eerie X-Ray Glow Comes from 'Hot Bubble'
Monday, July 28, 2014 - 11:30
in Astronomy & Space
A mysterious glow that fills the sky and can be seen only with X-ray detectors has been explained. Much of the glow, discovered more than 50 years ago, is produced from hot gas lurking in a giant cavity of space some 300 light-years from the sun.