AUDIO: Gamma rays are the most energetic form of light. They move like bullets at light speed, as tiny particles of light called photons, with millions to billions of times more energy than visible light. Imagine standing on a mountaintop and gazing at the night sky with gamma-ray eyes. The familiar look of the night time stars would give way to the exotic and the mysterious. Collapsed spinning stars and supernova remnants, massive black holes, and gamma-ray bursters, the most powerful sources of energy seen across the known Universe. VIDEO DESCRIPTION: Video showing the visible spectrum, artist concept of gamma rays, the night time sky changing to the night time sky through gamma ray eyes (pink). Through gamma ray eyes - collapsing star, supernova remnant, black hole, and gamma ray burst.