This animation starts by showing a proton traveling close to the speed of light striking a slower-moving proton.
The protons survive the collision, but their interaction creates an unstable particle -- a pion -- with only 14
percent of the proton's mass. In 10 millionths of a billionth of a second, the pion decays into a pair of
gamma-ray photons. Years of data collected by NASA's Fermi Gamma-Ray Space Telescope reveal that the
shattered remains of a supernova first observed in 1572 ...
http://www.nasa.gov/multimedia/videogallery/index.html?media_id=124302581
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