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"But high-energy cosmic rays also form neutrinos, which travel in straight lines so are easier to trace back to their source."

(The Guardian.)

What forms what? Do neutrinos form cosmic rays or vice versa?

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vice versa

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Thank you for the reply.

And energetic particles — mostly protons — from outer space, called cosmic rays, bombard our atmosphere to produce showers of neutrinos (along with other particles).

http://www.abc.net.au/news/science/2018-07-13/neutrino-antarctica-icecube-astroparticle-physics-b...

Thank you for the link.

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