Ultra-high-energy cosmic rays are possible candidate. For example, Oh-My-God particle had energy of a baseball traveling at 100 km/h. 40 million times higher th

Ultra-high-energy cosmic rays are possible candidate. For example, Oh-My-God particle had energy of a baseball traveling at 100 km/h. 40 million times higher than particle energies of terrestrial accelerators. https://en.wikipedia.org/wiki/Oh-My-God_particle https://en.wikipedia.org/wiki/Oh-My-God_particle