Particles that can hit the Earth’s atmosphere at high speeds.

Source: University of Chicago Library

Enrico Fermi’s notebook of December 1948 contains four pages that represent the genesis of his theory of cosmic rays, particles that can hit the Earth’s atmosphere at high speeds. In these pages, he worked out the acceleration of cosmic rays due to a series of collisions with magnetic clouds moving through the universe, a process later named Fermi acceleration.SEE:Archive: Logbook

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