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Cosmic ray

3:40

ScienceCasts: The Mystery of High-Energy Cosmic Rays

1:21

Cosmic rays' impact on phones

3:43

What are Cosmic Rays?

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Rare Cosmic Ray Caught in a Cloud Chamber

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NASA Telescope Discovers the Origin of Cosmic Rays

Cosmic rays are high-energy radiation, mainly originating outside the Solar System and even from distant galaxies. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface. Composed primarily of high-energy protons and atomic nuclei, they are of uncertain origin. Data from the Fermi Space Telescope (2013) have been interpreted as evidence that a significant fraction of primary cosmic rays originate from the supernova explosions of stars. Active galactic nuclei also appear to produce cosmic rays, based on observations of a neutrino and gamma rays from blazar TXS 0506+056 in 2018.
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