C/A		Closest Approach
CAD		Convair Astronautics Division
CASC		China AeroSpace Corporation
CAST		Chinese Academy of Space Technology
CAT		Capsule Ariane Technologique
CBS		Calcium Balance Study
CC		Cape Canaveral
CCAAF		Cape Canaveral Auxiliary Air Force
CCAFS		Cape Canaveral Air Force Station
CCB		Common Core Booster
CCE		Charge Composition Explorer
CCG		Cardiovascular Conditioning Garment
CCI		Constellation Communications Incorpored
CCMTA		Cape Canaveral Missile Test Annex
CDS		Coronal Diagnostic Spectrometer
CE		Circular Error
CEASE		Compact Environmental Anomaly Sensor Experiment
CEBAS		Closed Equilibrated Biological Aquatic System
CECLES		Commision Europeen pour le Construccion du Lanceurs d'Engines Spatiales
CELIAS		Charge Element and Isotope Analysis System
CERN		Conseil Europèen pour la Recherche Nuclèaire
CIB		Controlled Image Base
CIBX		Commercial Ita Biological eXperiment
CID		Commercial Imagery Dissemination
CIT		California Institute of Technology
CM		Combustion Module
CM		Command Module
CMPCG		Commercial Macromolecular Protein Crystal Growth
CMPT		Chinese Ministry of Posts and Telecommunications
CNES		Centre National d'Etudes Spatiales
COBE		COsmic Blackground Explorer
COF		Columbus Orbital Facility
COM2PLEX		COMbined 2-Phase Loop EXperiment
COMOR		COMmittee on Overhead Reconnaissance
COMSAT		COMunication SATellite
CONIE		COmisión Nacional de Investigación del Espacio
CONTEL		CONtinental TELephone company
COPERS		Commission Préparatory European Research Space
COS		Celestial Observation Satellite
COSPAR		COmmittee on SPAce Research
COSTEP		COmprehensive Supra Thermal and Energetic Particle analyser
CPCG-PCF		Commercial Protein Crystal Growth-Protein Crystallization Facility
CPE		Circular Probable Error
CPP		Color Patch Photography
CPS		Cycles Per Second
CR		Celestial Radiometry
CSA		Canadian Space Agency
CSAR		Communications Satellite Advanced Research
CSIL		Commercial Imagery Satellite Library
CSG		Centre Spatial Guyanais
CSM		Command and Service Module
CTBS		China Telecommunications Broadcast Satellite corp.
CTF-NMCI		Commander Task Force-Navy/Marine Corps Intranet
CTS		Cloud Top Spectrometer
CTS		Communications Technology Satellite
CZ		Chang Zheng
CZCS		Coastal Zone Color Scanner