cosmic ray

cosmic ray

noun

Definition of COSMIC RAY

: a stream of atomic nuclei of extremely penetrating character that enter the earth's atmosphere from outer space at speeds approaching that of light

First Known Use of COSMIC RAY

1925

Rhymes with COSMIC RAY

Adige, A-OK, alleyway, All Fools' Day, All Saints' Day, All Souls' Day, all the way, anyway, appliqué, Arbor Day, arrivé, atelier, attaché, back away, ballonet, bang away, Bastille Day, Beaujolais, beta ray, beurre manié, BHA, blow away, botonée, Boxing Day, breakaway, break away, Bristol Bay, bustier, by the way, cabaret, cableway, Camagüey, canapé, cap-a-pie, Cape Cod Bay, caraway, carriageway, cassoulet, castaway, cathode ray, champlevé, chansonnier, chardonnay, Charolais, chevalier, china clay, cloisonné, cog railway, colorway, Condorcet, consommé, coryphée, croupier, crudités, cutaway, day-to-day, debauchee, déclassé, dégagé, degree-day, delta ray, démodé, devotee, disarray, disobey, distingué, divorcé, divorcée, DNA, dollar day, double play, draw away, dress-down day, eagle ray, eightfold way, émigré, engagé, entranceway, entremets, entryway, espalier, everyday, exposé, expressway, fadeaway, fallaway, fall away, faraday, Faraday, faraway, fiancé, fiancée, fill away, fire away, flageolet, flyaway, foldaway, gal Friday, gamma ray, garde-manger, Georgian Bay, getaway, girl Friday, giveaway, give away, gratiné, gratinée, Greenaway, Groundhog Day, guillemet, Harare, hell to pay, Hemingway, hereaway, hideaway, hit the hay, HLA, holiday, holy day, Hornaday, Hudson Bay, Hugh Capet, Humboldt Bay, in a way, inter se, interplay, intraday, IPA, IRA, Ise Bay, judgment day, keep-away, kyrie, Labor Day, lackaday, latter-day, layaway, lay away, lingerie, macramé, Mandalay, manta ray, Massenet, matinee, medal play, meet halfway, MIA, Milky Way, Monterrey, Mother's Day, motorway, muscadet, mystery play, negligee, New Year's Day, New York Bay, Nicolet, night and day, Nottaway, off Broadway, Ojibwa, on the way, out of play, overlay, overplay, overstay, overweigh, Paraguay, passageway, pass away, passion play, pepper spray, Petare, photoplay, pikake, pis aller, play-by-play, plug-and-play, popinjay, potter's clay, pourparler, pousse-café, power play, present-day, protégé, protégée, pull away, put away, Put-in-Bay, Rabelais, rack railway, rainy-day, rambouillet, ratiné, recamier, recherché, reconvey, repartee, repoussé, résumé, retroussé, ricochet, right away, right-of-way, rockaway, roentgen ray, rondelet, roundelay, RNA, runaway, run away, Saguenay, salt away, San Jose, Santa Fe, São Tomé, Saturday, satyr play, semplice, Seventh-Day, severance pay, shadow play, sleepaway, sobriquet, sock away, sommelier, square away, steerageway, standaway, stowaway, straightaway, street railway, Table Bay, taboret, tarsier, taxiway, tearaway, tear away, teleplay, Tenebrae, thataway, throwaway, throw away, Thunder Bay, triple play, turn away, Udine, underlay, underpay, underplay, underway, Uruguay, velouté, Venite, vérité, vertebra, virelay, walkaway, Wang Ching-wei, waterway, wellaway, Whitsunday, workaday, working day, Yenisey, Zuider Zee

cosmic ray

noun    (Concise Encyclopedia)

High-speed particle (atomic nucleus or electron) that travels through the Milky Way Galaxy. Some cosmic rays originate from the Sun, but most come from outside the solar system. Primary cosmic rays that reach Earth's atmosphere collide with nuclei in it, creating secondaries. Because lower-energy primaries are strongly influenced by the interplanetary magnetic field and Earth's magnetic field (see geomagnetic field), most of those detected near Earth have very high energy, corresponding to speeds about 87% that of light or more. Observations from spacecraft indicate that most cosmic rays come from the Galaxy's disk, but the highest-energy ones are probably extragalactic. Details of their production and acceleration remain unclear, but apparently expanding shock waves from supernovas can accelerate particles. From the early 1930s to the 1950s, cosmic rays were the only source of high-energy particles used in studying the atomic nucleus and its components. Short-lived subatomic particles were discovered through cosmic-ray collisions, leading to the rise of particle physics. Even powerful particle accelerators cannot impart energy anywhere near that of the highest-energy cosmic rays. See also Victor Francis Hess.