• C/1999 S4 comet
• C/1999 T1
• C/2001 A2
• c/2002 c1
• c/2002 x5
• c/2007 n3
• Cae
• Caelum
• caldera
• california
• California Nebula
• Callisto
• Caloris Basin
• Calypso
• Cam
• Camelopardalis
• camera
• Canadarm2
• Canary islands
• Cancer
• Canes Venatici
• Canes Venatici cloud
• Canis Major
• Canis Minor
• canyon
• Cap
• Cape Canaveral
• Capricornus
• Car
• carbon dioxide
• carbon star
• Carina
• carina nebula
• Carl Sagan
• Cartwheel galaxy
• Cas
• Cas A
• Casimir effect
• cassini spacecraft
• Cassiopeja
• cataclysmic variable
• catena
• Cat's Eye Nebula
• Cat's Paw nebula
• cavus
• CCD
• cD galaxy
• celestial pole
• Cen
• Centaurus
• Centaurus A
• Centaurus cluster
• central bar
• century
• Cep
• cepheid
• Cepheus
• Ceres
• CERN
• Cerro Tololo
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• Cet
• CETI
• Cetus
• CFHT Telescope
• CGRO
• Cha
• Chamaeleon
• Chandra
• chaos
• Charles Conrad
• Charles Messier
• Charon
• chasma
• China
• chlorophyll
• Cigar galaxy
• Cir
• Circinus
• Circinus Galaxy
• circumstellar
• circumstellar disk
• classical nova
• climate
• clouds
• cluster
• cluster gas
• cluster of galaxies
• Clyde Tombaugh
• CMa
• CMB
• CMBR
• cmd
• CME
• CMi
• Cnc
• CO2
• COBE
• coded aperture
• Col
• COLBERT
• colliding galaxies
• color
• Colorado
• Columba
• Com
• Coma
• Coma Berenices
• Coma Cluster
• comet
• cometary globule
• comet Borrelly
• comet Encke
• Comet Hale-Bopp
• comet Halley
• comet Holmes
• comet Hyakutake
• comet Ikeya-Zhang
• Comet Lee
• comet linear
• Comet Linear WM1
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• comet Lulin
• Comet Machholz
• Comet McNaught
• comet mcnaught-hartley
• Comet NEAT
• comet nucleus
• comet Shoemaker-Levy 9
• Comet Swan
• comet tail
• comet Tempel-Tuttle
• Comet Wild 2
• composite image
• compton
• Cone nebula
• conjunction
• constellation
• convection
• Copernicus
• corona
• Corona Australis
• Corona Borealis
• coronal hole
• coronal loop
• coronal mass ejection
• Corvus
• cosmic microwave background radiation
• cosmic rays
• Cosmic Snowball
• cosmogeny
• cosmological constant
• cosmology
• cosmonaut
• CrA
• Crab Nebula
• crater
• crater chain
• craters
• CrB
• crepuscular rays
• crescent
• Crescent Nebula
• CRL 2688
• CRL 618
• Crt
• Cru
• crust
• Crux
• Crv
• CVn
• CW Leonis
• cyclone
• Cydonia
• cydonia region
• Cyg
• Cygnus
• Cygnus loop
• Cygnus Wall
• Cyg X-1
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