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The acronyms listed below were placed into one or more of these categories:
* AstrophysicsTerminologia terminologydell'astrofisica – ''a general category for physics-related acronyms''
* [[catalogo astronomico|Catalogo]] – ''a category for collections of tabulated scientific data''
* reteRete di comunicazione – ''a category that includes any network that functions primarily to communicate with [[spacecraft]] rather than performing astronomy''
* Data – ''a general category for astrophysical data not associated with any single catalog or observing program''
* [[Corpo celeste]] – ''a category that contains acronyms for natural objects in space and for adjectives applied to objects in space''
== C ==
* [[Catalogo Cambridge|C]] - (''catalogo'') "Cambridge Catalog", catalogo Cambridge; 2C ([[Second Cambridge Catalog]]), 3C ([[Third Cambridge Catalog]])
* [[Canadian Astronomy Data Centre|CADC]] – (''organizationorganizzazione'') "Canadian Astronomy Data Centre"
* [[Calar Alto Observatory|CAHA]] – (''organizationorganizzazione'') "Centro Astronómico Hispano Alemán", ''aun German-SpanishCentro AstronomicalAstronomico CentreTedesco-Ispanico''
* CANDELS – (surveysondaggio) "Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey" oro "Cosmic Assembly and Dark Energy Legacy Survey"
* [[Cassini Plasma Spectrometer|CAPS]] – (''instrumentationstrumentazione'') "Cassini Plasma Spectrometer", ''anuno instrumentstrumento ondella thesonda [[Cassini–Huygens|Cassini-Huygens]] spacecraft''
* [[California Association for Research in Astronomy|CARA]] – (''organizationorganizzazione'') "California Association for Research in Astronomy"
* [[Center for Astrophysical Research in Antarctica|CARA]] – (''organizationorganizzazione'') "Center for Astrophysical Research in Antarctica" ''Centro per la ricerca dell'astrofisica in Antartide''
* [[Canadian Astronomical Society|CASCA]] – (''organizationorganizzzione'') "Canadian Astronomical Society" / "Société canadienne d'astronomie" (the nameil isnome officiallyè bilingualufficialmente bilingue)<ref>{{citecita web|url=http://www.casca.ca/ |titletitolo=CASCA | Canadian Astronomical Society | Société Canadienne d'Astronomie |publishereditore=Casca.ca |datedata= |accessdateaccesso=2012-02-22}}</ref>
* [[Center for Advanced Space Studies|CASS]] – (''organizationorganizzazione'') "Center for Advanced Space Studies", ''centro per gli studi spaziali avanzati''
* [[CosmicRadiazione Backgroundcosmica Radiationdi fondo|CBR]] – (''celestialoggetto objectceleste'') "Cosmic Background Radiation", ''Radiazione cosmica di fondo''
* CC – (''celestial object'') Candidate Companion, ''a newly detected observed object that initially appears to orbit another celestial object''
* [[charge-coupled device|CCD]] – (''instrumentation'') Charge Coupled Device
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