CES: Conical Earth Sensor
CES: Crew Escape System
CFF: Columbus Free Flyer
CFP: Conceptual Flight Profile
CGRO: Compton Gamma Ray Observatory
CHAMP: Challenging Minisatellite Payload
CHIPS: Cosmic Hot Interstellar Spectrometer
ChJA: Chinese Journal of Aeronautics
ChJAA: Chinese Journal of Astronomy and Astrophysics
ChJSS: Chinese Journal of Space Science
ChSAJ: Chinese Society of Astronautics Journal
ChSST: Chinese Space Science Technology
CIRCE: Confusion-limited Infrared Cosmology Explorer
CIRRIS: Cryogenic InfraRed Radiance Instrument for Shuttle
CIRRIS: Cryogenic Infrared Radiance Instrumentation for Shuttle
CLM: Circumlunar Mission
CLOT: Combined Loads Orbiter Test
CLS: Collecte Localisation Satellites
CLS: Contingency Landing Site
CLSO: Contingency Landing Support Officer
CNSA: China National Space Administration
COBE: Cosmic Background Explorer
CoFR: Certificate of Flight Readiness
CoFR: Certification of Flight Readiness
COFW: Certificate of Flight Worthiness
COMAS: Combined Orbital Maneuvering and Abort System
Comsat: Communications Satellite
ComSp: Commercial Space
COMTR: COMSAT Technical Review
COP: Co-Orbiting Platform
COROT: COnvection, ROtation & Planetary Transits
CORSA: Cosmic Radiation Satellite
COSPAR: Committee on Space Research
COSTAR: Corrective Optics Space Telescope Axial Replacement
CPF: Cost Per Flight
CRAF: Comet Rendezvous/Asteroid Fly-by
CRALT: CNES Radar Altimeter
CRRES: Combined Release and Radiation Effects Satellite
CSA: Canadian Space Agency
CSCSAT: Commercial Synchronous Communication Satellite