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What are cosmic rays? (Multiple Choice)

doit_the_clown

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What are cosmic rays? (Multiple Choice)

What are cosmic rays?
A)   The steady, low-energy flux of neutral atoms into the solar system due to the passage of the Sun through the interstellar medium
B)   Neutron beams emitted along the rotational axes of accretion disks around neutron stars
C)   Beams of photons produced by rotating, magnetic neutron stars
D)   Atomic nuclei and other subatomic particles traveling through space at more than 90% of the speed of light

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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