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cosmic ray

noun, Physics.
a radiation of high penetrating power that originates in outer space and consists partly of high-energy atomic nuclei.
Origin of cosmic ray
1920-25, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for cosmic rays
Historical Examples
  • They had molecular rays, cosmic rays, the energy of matter, then—what else had they now?

    Invaders from the Infinite John Wood Campbell
  • Now, our process is only an adaptation of these cosmic rays.

  • The Ancient Mariner spun about, turned toward the other ship, and let loose a tremendous bombardment of molecular and cosmic rays.

    Invaders from the Infinite John Wood Campbell
  • Of course, if it is coming from outside the stratosphere as the cosmic rays do, there is no hope.

    The End of Time Wallace West
  • It was amazingly sensitive to any form of radioactivity—and the missile, of course, would be "hot" from exposure to cosmic rays.

  • And he screamed into the now fading glow that he knew was the energy of the cosmic rays.

    The Monster S. M. Tenneshaw
  • They know about our theoretical work on cosmic rays, including Suzanne's work up to about a month ago.

    The Mercenaries Henry Beam Piper
  • Suppose this is what happens when living tissue is exposed to cosmic rays or whatever is up there.

    The Day of the Dog Anderson Horne
  • He was remembering the man's words on the cosmic rays and the secret of eternal life they held.

    The Monster S. M. Tenneshaw
  • It has molecular rays, magnetic beams and cosmic rays, and a fourth weapon we know nothing of.

    Invaders from the Infinite John Wood Campbell
British Dictionary definitions for cosmic rays

cosmic rays

plural noun
radiation consisting of particles, esp protons, of very high energy that reach the earth from outer space Also called cosmic radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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cosmic rays in Science
cosmic ray  
A ray of radiation of extraterrestrial origin, consisting of one or more charged particles such as protons, alpha particles, and larger atomic nuclei. Cosmic rays entering the atmosphere collide with atoms, producing secondary radiation, such as pions, muons, electrons, and gamma rays. Cosmic rays (and secondary radiation) can be easily seen in a cloud chamber.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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cosmic rays in Culture

cosmic rays definition

Elementary particles, mainly protons, that are produced by the sun and other stars and then strike the upper atmosphere of the Earth. Some of these particles are absorbed, some help form the Van Allen belt, and some reach the Earth's surface, where they form a part of the background radiation that constantly surrounds us.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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cosmic rays in Technology

Notionally, the cause of bit rot. However, this is a semi-independent usage that may be invoked as a humorous way to handwave away any minor randomness that doesn't seem worth the bother of investigating. "Hey, Eric - I just got a burst of garbage on my tube, where did that come from?" "Cosmic rays, I guess." Compare sunspots, phase of the moon. The British seem to prefer the usage "cosmic showers"; "alpha particles" is also heard, because stray alpha particles passing through a memory chip can cause single bit errors (this becomes increasingly more likely as memory sizes and densities increase).
Factual note: Alpha particles cause bit rot, cosmic rays do not (except occasionally in spaceborne computers). Intel could not explain random bit drops in their early chips, and one hypothesis was cosmic rays. So they created the World's Largest Lead Safe, using 25 tons of the stuff, and used two identical boards for testing. One was placed in the safe, one outside. The hypothesis was that if cosmic rays were causing the bit drops, they should see a statistically significant difference between the error rates on the two boards. They did not observe such a difference. Further investigation demonstrated conclusively that the bit drops were due to alpha particle emissions from thorium (and to a much lesser degree uranium) in the encapsulation material. Since it is impossible to eliminate these radioactives (they are uniformly distributed through the earth's crust, with the statistically insignificant exception of uranium lodes) it became obvious that one has to design memories to withstand these hits.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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