Before revision: Computation The limit was independently computed in 1966 by Kenneth Greisen, Georgiy Zatsepin, and Vadim Kuzmin based on interactions between cosmic rays and the photons of the cosmic microwave background radiation (CMB).
After revision: Computation The limit was independently computed in 1966 by Kenneth Greisen, Georgy Zatsepin, and Vadim Kuzmin based on interactions between cosmic rays and the photons of the cosmic microwave background radiation (CMB).