History of the Universe

History of the Universe eBook. 398 pages, 300 illustrations only £5.99

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Cosmic Rays

When stars explode they throw out some particles at high speed. These travel through space as cosmic rays. Their speeds are truly phenomenal -- over half the speed of light.

When these particles hit the Earth's atmosphere they are called primary cosmic rays. 85% of these are protons, 12% alpha particles and the rest are electrons heavy nuclei.

These collide with the air to create neutrinos.

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