Better link would be to http://en.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray http://en.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray which gives some spe

Better link would be to http://en.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray http://en.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray which gives some speculation as to what causes them.