Definitions
There is 1 meaning of the phrase
Cosmic Ray.
Cosmic Ray - as a noun
Highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds
Example Sentences
"Scientists study cosmic rays to learn more about the universe."
"Space travel exposes astronauts to higher levels of cosmic rays."
"The Earth's atmosphere protects us from most cosmic rays."
"Some cosmic rays have extremely high energies, even greater than those produced by particle accelerators on Earth."
"Prolonged exposure to cosmic rays can pose health risks to astronauts."
