
Energetic charged particles colliding with Earth from outer space
Found on
http://jot101.com/2015/05/a-z-of-science-fiction-words/

Subatomic particles that move through space close to the speed of light; their origin is one of the major unsolved mysteries of astrophysics, although researchers are moving closer to a solution. Cosmic rays consist of about 85% protons, 14% alpha particles (helium nuclei), about 1% electrons and ot...
Found on
http://www.daviddarling.info/encyclopedia/C/cosmicrays.html

High-energy ionising radiation from Outer Space.
Found on
http://www.em-surveys.co.uk/Definitions%201.html

High velocity particles reaching Earth from outer space. The heavier cosmic ray particles are broken up when they enter Earth's upper atmosphere.
Found on
http://www.encyclo.co.uk/local/20448

<radiobiology> High velocity particles of enormous energies, bombarding earth from outer space. ... It consists of protons and more complex atomic nuclei that, on striking the atmosphere, give rise to neutrons, mesons, and other less energetic radiation. ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

Any of the particles from outer space that are continuously colliding with the Earth's atmosphere. They are mostly protons, with some nuclei, electrons, and photons. Their interactions with the atmosphere produce a variety of particles, including pions, muons, and neutrinos.
Found on
http://www.encyclo.co.uk/local/21425

Radiation originating from outside the Earth's atmosphere. The term 'cosmic ray' can actually include a number of classes of high energy radiation including Gamma Rays , Electrons and Ions .
Found on
http://www.ionactive.co.uk/glossary_atoz.html?s=az&t=c

Type: Term Definitions: 1. high-velocity particles of enormous energies, bombarding earth from outer space; the 'primary radiation' consists of protons and more complex atomic nuclei that, on striking the atmosphere, give rise to neutrons, mesons, and other less energetic 'secondary radiation.'
Found on
http://www.medilexicon.com/medicaldictionary.php?t=75977

are the particles which impinge on the top of the Earth's atmosphere. They are one of the sources of information about the relative abundances of elements in the Universe. Although they are predominantly protons, their elemental composition does exhibit differences with respect to the so-called 'universal' abundances, especially for light elements ...
Found on
http://www.sheffield.ac.uk/polopoly_fs/1.14548!/file/glossary.pdf

cosmic rays A reference both to primary and to secondary cosmic rays. Primary cosmic rays are submicroscopic, electrically charged particles, largely protons, that travel in space at speeds nearly equal to that of light.
Found on
http://www.wordinfo.info/words/index/info/view_unit/550/2

High energy particles from outer space.
Found on
https://www.encyclo.co.uk/local/21322

High-speed particles that reach the Earth from Outer Space.
Found on
https://www.encyclo.co.uk/local/22784
No exact match found.