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Cosmic rays are energetic particles originating from space that impinge on Earth's atmosphere.
Almost 90% of all the incoming cosmic ray particles are protons, about 9% are helium nuclei
(alpha particles) and about 1% are electrons. The term "ray" is a misnomer, as cosmic particles
arrive individually, not in the form of a ray or beam of particles.
Today I decided to experiment with backlighting:
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