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This Shower of Gamma Rays Is from a Flaring Blazar 5 Billion Years Ago

Five billion years ago, a blazar abruptly flared, triggered an intense rain of gamma rays. Racing across the universe for millennia, they finally slammed into NASA’s Fermi satellite over several days this June, setting a new record for the most luminous high-energy object we’ve ever seen. »7/11/15 10:39am7/11/15 10:39am

Gamma Rays of the Dead Shine Like a Nightmare into the Eyes of the Living

When you look into the heart of the Crab Nebula, you are staring at the gamma-radiation-soaked nightmare of history. You may have already known that this gorgeous nebula is the result of a supernova that Chinese and Arab astronomers recorded back in 1054. But what you didn't know is that the dead star became a pulsar… »8/28/08 4:30pm8/28/08 4:30pm