cosmic radiation
high-speed, i.e. high-energy particle, mainly originating in outer space, outside the Solar system
galactic cosmic ray
cosmic ray whose origin lies outside our solar system
extragalactic cosmic ray
very-high-energy particles that flow into the Solar System from beyond the Milky Way galaxy
ultra-high-energy cosmic ray
cosmic-ray particle with a kinetic energy greater than 1 EeV (10¹⁸ eV)