Gamma-Ray Burst From Chandra X-Ray Observatory

392439 04: An image of NASA''s Chandra X-ray Observatory and Hubble Space Telescope shows a halo of hot gas surrounding spiral galaxy NGC 4631 that is similar to the Milky Way galaxy, June 19, 2001. The orange color in the middle of the image represents ultraviolet radiation as observed by UIT, tracing massive stars in the galaxy. (Photo Courtesy of NASA/Getty Images)