sideranautae
Mongoose
Cosmic ray particles with even higher energies have since been observed. Among them was the Oh-My-God particle observed on the evening of 15 October 1991 over Dugway Proving Ground, Utah. Its observation was a shock to astrophysicists, who estimated its energy to be approximately 3×1020 eV (50 J) - in other words, a subatomic particle with kinetic energy equal to that of a baseball (5 ounces or 142 grams) traveling at about 100 kilometers per hour (60 mph). It was most likely a proton traveling very close to the speed of light, slower by only about 1.5 femtometers per second, or at about 0.9999999999999999999999951⋅c, based on its observed energy.
That was just one such particle!
http://en.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray
That was just one such particle!
http://en.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray
