Where do cosmic rays come from?

Where do cosmic rays come from?

Earth is under constant bombardment by cosmic rays, showers of high-energy particles that blast our planet from all directions at near light speed.

While this might sound like the precursor to a sci-fi alien invasion, it is a real phenomenon that scientists have been aware of for over a century. Despite their dramatic description, cosmic rays are actually pretty ordinary — they pass through our planet so regularly that during an average night’s sleep, a person will have around a million cosmic rays traveling through their body, according to the University of Birmingham in the U.K. 

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