The Gamma Ray Sky . ... Credit Copyright: EGRET Team , Compton Observatory , NASA Explanation: What if you could "see" gamma rays? ... In the early 1990s NASA's orbiting Compton Observatory , produced this premier vista of the entire sky in gamma rays - photons with more than 40 million times the energy of visible light . The diffuse gamma-ray glow from the plane of our Milky Way Galaxy runs horizontally through the false color image. ... NASA Web Site Statements, Warnings, and Disclaimers . ...