Sky's Eerie X-Ray Glow Comes from 'Hot Bubble'

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.



via LiveScience.com http://ift.tt/1rS9g7A