What are cosmic rays?
A) 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
Correct Answer:
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A) shower
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