Ultra-high-energy cosmic ray
An ultra-high-energy cosmic ray is a cosmic ray with energy above roughly 10¹⁸ electronvolts. Its origin is outside the Solar System and is usually attributed to an extragalactic source.
An ultra-high-energy cosmic ray is a cosmic ray with energy above roughly 10¹⁸ electronvolts. Its origin is outside the Solar System and is usually attributed to an extragalactic source.