Cabibbo angle
cabin
Cacciatore, Niccolò (1780-1841)
cadmium
caduceus
Caelum (constellation)
Caesar cipher
Cage, John (1912-1992)
Caidin, Martin (1926-)
Cairns-Smith, A. Graham
cake-cutting
Calabash Nebula (OH231.8+4.2)
Calabi-Yau space
calcite
calcitonin
calcium
calcium aluminum inclusions
calculus
calculus of variations
caldera
calendar
calendar curiosities
calf muscles
Caliban
Caliban puzzle
California Nebula (NGC 1499)
CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Observations)
Callisto
Callisto, ocean and possible life
calorie
Caloris Basin (Mercury)
Caltech Submillimeter Observatory
Calvin, Melvin (1911-1997)
Calvin cycle
Calypso
calyx
camber
cambium
Cambrian
Camelopardalis (constellation)
Cameron, Alastair G. W.
Campanella, Tommaso (1568-1634)
Campbell, Jr., John W(ood) (1910-1971)
Campbell, William Wallace (1862-1938)
CANADA IN SPACE
Canada-France-Hawaii Telescope
Canadarm
Canadian Space Agency (CSA)
Canadian Space Society (CSS)
canali
canals, Mars
Canberra Deep Space Communication Complex
cancer
Cancer (constellation)
55 Cancri (Rho¹ Cancri)
Canes Venatici (constellation)
candela
candidate gene
Canes Venatici Cloud
Canes Venatici I Group
Canes Venatici II Group
Canis Major (constellation)
Canis Major Dwarf
Canis Minor (constellation)
cannibalism, interstellar
Cannon, Annie Jump (1863-1941)
Cannonball Problem
canonical form
Canopus (Alpha Carinae)
canted nozzle
Cantor, Georg Ferdinand Ludwig Philipp (1845-1918)
Cantor dust
Canyon (spy satellites)
cap
capacitance
capacitor
CapCom
Cape Canaveral
Cape Canaveral Air Force Station
Cape Kennedy
Cape Photographic Dürchmusterung (CPD)
Cape York meteorite
Capella (Alpha Aurigae)
Caph (Beta Cassiopeiae)
capillary
Capricornus (constellation)
Capricornus Dwarf (Palomar 12)
captive test
capture
capture area
captured atmosphere
captured rotation
carapace
carbohydrate
carbon
carbon burning
carbon cycle
carbon dioxide
carbon fixation
carbon monoxide
carbon nanotube
carbon star
carbon-14
carbonaceous chondrite
carbonate
carbon-based life
Carboniferous period
carbon-nitrogen cycle
carbonyl group
carboxyl group
carboxylic acids
carcinoma
Cardano, Girolamo (1501-1570)
cardiac catheterization
cardiac CT
cardiac MRI
cardiac muscle
cardiac rehabilitation
cardinal number
cardiogenic shock
cardioid
cardiomyopathy
cardiovascular deconditioning
cards
Carina (constellation)
Carina Dwarf Galaxy
Carina OB1 and OB2
Carme
Carmichael number
Carnegie & California Planet Search
Carnegie Observatories
Carnot cycle
carotene
carotenoids
carotid artery
carotid artery disease
carotid ultrasound
carpal
carpal tunnel syndrome
carpel
Carpenter, Malcolm Scott (1925-)
Carr, Gerald P. (1932-)
carrier
carrier particle
carrier wave
Carrington, Richard Christopher (1826-1875)
Carroll, Lewis (1832-1898)
Carte du Ciel
Carter, Jimmy (1924-)
Cartesian coordinates
Cartesian oval
cartilage
Cartwheel Galaxy (ESO350-40)
cascade liquefier
Cascade Mountains
casein
Casimir effect
casparian strip
Cassegrain telescope
Cassini (spacecraft)
Cassini, Giovanni Domenico (1625-1712)
Cassinian ovals
Cassiopeia (constellation)
Cassiopeia Dwarf (Cas dSph)
Cassiopeiae A (3C 461)
cast propellant
Castalia (minor planet 4769)
casting out nines
Castor (Alpha Geminorum)
Castor and Pollux (French satellites)
Castor Moving Group
catabolism
cataclysmic binary
cataclysmic variable
catadioptric telescope
Catalan number
Catalan solid
Catalan's conjecture
Catalan's constant
catalase
catalysis
catalyst
catastrophe theory
catastrophic hypothesis
catecholamines
category theory
catenary
catenoid
Catch-22
Cathcart, Richard Brook (1943-)
catheter
catheter ablation
cathetus
cathode
cathode rays
Cat's Eye Nebula (NGC 6543)
CATSat (Cooperative Astrophysics and Technology Satellite)
Cauchy, Augustin Louis, Baron (1789-1857)
Cauchy horizon
cauda equina
caudal
causal structure
causality
causality loop
caustic curve
Cavalieri's principle
Cavendish, Margaret (1623-1673)
cavitation
Cayley, George (1773-1857)
Cayley, Arthur (1821-1895)
Cayley's mousetrap
Cayley's sextic
C-band
CCD
C-class asteroid
Cech, Thomas R. (1947-)
cecum
ceiling
celestial coordinates
celestial equator
celestial guidance
celestial mechanics
celestial pole
celestial sphere
Celestis, Inc.
cell
CELL BIOLOGY
cell cycle
cell division
cell membrane
cell membranes, origin
cell vacuole
cell wall
cellular automaton
cellulose
celt
Cenozoic era
Centaur (minor planet)
Centaur (rocket)
Centaurus (constellation)
Centaurus A (NGC 5128)
Centaurus Cluster
Centaurus X-3
Center for Astronomical Adaptive Optics (CAAO)
Center for UFO Studies (CUFOS)
center of gravity
center of mass
center-of-mass energy
center of perspective
center of pressure
centimorgan
central angle
central meridian
central nervous system
centrifugal force
centrifuge
centriole
centripetal acceleration
centripetal force
centroid
centromere
centrosome
century
cephalic
cephalopod intelligence
cephalopods
cephalothorax
Cepheid variable
Cepheus (constellation)
cerebellum
cerebrospinal fluid
cerebrum
Cerenkov counter
Cerenkov radiation
Ceres (minor planet 1)
CERISE (Characterisation de l'Environment Radio-electrique par un Instrument Spatial Embarque)
CERN
Cernan, Eugene Andrew (1934-)
Cerro Tololo Inter-American Observatory
Cerulli, Vicenzo (1859-1927)
cervical
cervix
cesium
cetaceans
CETEX
CETI
CETI, opposition to
Cetus (constellation)
Ceva, Giovanni (1647-1734)
c.g.s. units
CH Cygni
CH star
Chaffee, Roger Bruce (1935-1967)
chain of being, great
chain reaction
Chaitin, Gregory (1947-)
Chaitin’s constant
chalcedony
Chalet/Vortex
chalk
Challenger
Challenger disaster
Chalmers, Thomas (1780-1847)
chamber pressure
Chamberlin, Thomas Chrowder (1843-1928)
Chamberlin-Moulton planetesimal hypothesis
Chameleon (constellation)
CHAMP (Challenging Minisatellite Payload)
Champernowne's Number
Champollion
Chandler wobble
Chandra X-ray Observatory
Chandrasekhar, Subrahmanyan (1910-1995)
Chandrasekhar Limit
Chang Zeng (Long March)
change ringing
chaos
chaotic attractor
chaotic control
chaotic inflationary theory
chaotic orbit
chaotic terrain
Chara (Beta Canum Venaticorum)
character theory
characteristic length
characteristic velocity
charge
charge conjugation
charge-coupled device (CCD)
Charles' law
charm
charmed particle
charmonium
Charon
chassignite
chelate
chelation
Chelomei, Vladimir Nikolaevich (1914-1984)
chemical fuel
chemical rocket
CHEMISTS
CHEMISTRY
chemoautotrophs
chemosynthesis
chemotaxsis
chert
chess
chest X-ray
Chicxulub Crater
Childhood's End
chimera
China Great Wall Industry Corporation (CGWIC)
CHINA IN SPACE
Chinese astronomy
Chinese fire-arrows
Chinese remainder theorem
Chinese rings
Chinese Room
CHIPSat (Cosmic Hot Interstellar Plasma Spectrometer satellite)
chirality
Chiron
chitin
Chladni, Ernst Florens Friedrich (1756-1827)
chlorine
chloroethene
chloroform
chlorophyll
chloroplasts
chloroquine
cholecystokinin
cholesterol
chondrite
chondrule
chord
chordate
chorion
choroid
choroid plexus
Christian doctrines and pluralism
Christmas Tree Cluster (NGC 2264)
chromatic aberration
chromatic number
chromatid
chromatin
chromatography
chromatophore
chromium
chromoplast
chromosome
chromosphere
chromospheric network
chronic obstructive pulmonary disease
chronogram
chronology horizon
Chronology Protection Conjecture
chronology-violating spacetime
chronon
Chryse Planitia
chuffing
Church, Alonzo (1903-1995)
Church-Turing thesis
Chyba, Christopher
chyle
chyme
CHZ
ciliary body
ciliary muscle
cilium
cinder cone
CINDI (Coupled Ion-Neutral Dynamics Investigations)
cinnabar
cipher
CIRA (Centro Italiano Richerche Aerospaziali)
circadian rhythm
Circinus (constellation)
Circinus Galaxy
Circinus X-1
circle
circle involute
circular cone
circular number
circular orbit
circular prime
circular velocity
circulatory system
circumcenter
circumcircle
circumference
circumlunar trajectory
circumplanetary space
circumpolar star
circumstellar disk
circumstellar maser
circumterrestrial space
cislunar
cissoid
cisterna chyli
cis-trans isomerism
citrate
citric acid
citric acid cycle
City and the Stars, The
civilizations, extraterrestrial
Clairaut, Alexis Claude (1713-1765)
Clark, Alvan (1804-1887)
Clarke, Arthur C. (1917-2008)
Clarke Belt
class
classical jovian
CLASSICAL MECHANICS
classical planet
classical theory
CLASSIFICATION IN BIOLOGY
classification in mathematics
clastic rock
clathrate
Clauser, Francis H. (1913-)
Clausius, Rudolf (1822-1888)
clavicle
Clavius, Christoph (1537-1612)
Clavius crater (Moon)
clays, role in prebiotic evolution
Cleator, P(hilip) E(llaby) (1908-1994)
clelia
Clement, Hal (1922-2003)
Clementine
Clifford, William Kingdon (1845-1879)
cloaking device
clock puzzles
clone
cloning
close binary
close encounters
Close Encounters of the Third Kind
closed
closed curve
closed ecological system
closed time-like path
cloud chamber
CloudSat
Cloverleaf Quasar (H1413+117)
Cluster (satellite mission)
cluster of stars
cluster of galaxies
CN star
CNES (Centre National d’Etudes Spatiales)
cnidarian
CNO star
coacervate
Coalsack
coasting flight
Coathanger (Collinder 399)
cobalt
Cobb, Geraldine ("Jerrie") (1931-)
COBE (Cosmic Background Explorer)
Cocconi, Guiseppe (1914-)
coccus
coccyx
cochlea
cochlear implant
cochleoid
Cockcroft, John Douglas (1897-1967)
Cocoon Nebula (IC 5146)
cocoon star
Coddington’s Nebula (IC 2574)
codimension
coding theory
codomain
codon
coefficient
coefficient of friction
coelenteron
coelom
coelostat
coenzyme
coevolution
cofactor
coherent
cohesion
cohomology
coin paradox
Cold Bokkeveld meteorite
Cold War, linked to UFO reports
cold-flow test
cold gas attitude control system
Cole, Dandridge MacFarland (1921-1965)
collagen
Collatz problem
collenchyma
Collier's space program
Collins, Eileen Marie (1956-)
Collins, Michael (1930-)
collisions, with asteroids and comets
colloid
colloidal dispersion
colloidal propellant
Colombo, Guiseppe "Bepi" (1920-1984)
colon
colon and rectal cancer
colon and rectal cancer treatment
colonization, of space
color charge
color force
color
color excess
color index
color temperature
color-magnitude diagram
Columba
Columbia
Columbia Hills, Mars
Columbiad
Columbus Optical SETI Observatory (COSETI)
colure
coma, cometary
coma, optical
Coma Berenices (constellation)
Coma Cluster
Coma Star Cluster (Melotte 111)
Comas Sola, Jose
combination
combinatorics
combined magnitude
combustion
combustion chamber
combustion efficiency
combustion, incomplete
combustion instability
combustion limit
combustion oscillation
comet
COMETA ND ASTEROID MISSIONS
Comet Nucleus Tour
comet sample return probe
cometary collision hypothesis
cometary globule
COMETS
comets, collisions with
COMETS (Communications and Broadcasting Experimental Test Satellite)
COMINT (communications intelligence)
command destruct
Command Module
commensal
commensurable
Committee on Contamination by Extraterrestrial Exploration
Committee 14 on Exobiology
Committee on Planetary and Lunar Exploration
Committee on the Exploration of Extraterrestrial Space (CETEX)
common fraction
common-envelope star
communication, with the Moon and planets
communications satellite
commutative
compact galaxy
compact source
companion
companion, unseen
comparator
competitive exclusion
complement
complete
complete blood count (CBC)
complete graph
COMPLEX
complex adaptive system
complex analysis
complex number
complex system
complexity
complexity theory
composite
composite number
composite propellant
compound
compound eye
compound polyhedron
compressible
Compton effect
Compton Gamma-Ray Observatory
computability theorem
computable number
computed tomography (CT) scanning
computer
computer memory
COMPUTERS, ARTIFICIAL INTELLIGENCE, AND CYBERNETICS
Comsat (Communications Satellite Corporation)
concave
conchoid
condensation reaction
Condon, Edward Uhler (1902-1974)
Condon Report
cone
cone cell
Cone Nebula
cone stability
Conestoga
conformal mapping
congenital
congenital heart defects
conglomerate
Congreve, William (1772-1828)
congruent
congruum problem
conic sections
conjecture
conjugate
conjugated protein
conjugation
conjunction
conjunctiva
connected
connected graph
connectionism
connective tissue
connectivity
Conquest of Space
Conrad, Charles “Pete” Jr. (1930-1999)
conservation law
conservation of mass and energy
conservation of momentum
consistency
consistent histories
Constellation Program
CONSTELLATIONS
Constellation-X
constructible
contact (of an eclipse)
Contact (science fiction)
contact, with extraterrestrial intelligence
contact binary
contact ion thruster
contact lenses
containment
contamination
contig
contingency
continued fraction
continuity
continuous spectrum
continuously habitable zone
continuum
continuum hypothesis
CONTOUR (Comet Nucleus Tour)
contractile vacuole
contrast
control rocket
control rod
control surface
convection
Convection and Rotation of Stars (COROT)
convective envelope
convective overshoot
convergence
convergent evolution
convergent point
converter reactor
convex
Conway, John Horton (1937-)
Conway's chained-arrow notation
cooling timescale
Cooper, Leroy Gordon Jr. (1927-)
co-orbital
coordinate
Copeland's Septet (Hickson 57)
copepod
Copernican Revolution
Copernican system
Copernicus, Nicolaus (1473-1543)
Copernicus crater (Moon)
Copernicus Observatory
copolymer
copper (Cu)
coprime
Cor Caroli (Alpha² Canum Venaticorum)
coral
Coralie
Cordelia
Córdoba Durchmusterung (CD)
core, planetary
core, stellar
core electron
Coriolis (satellite)
Coriolis effect
cork cambium
corm
cornea
corneal diseases and disorders
corneal transplant
Cornell University
corolla
corona
Corona (spy satellites)
Corona Australis (constellation)
Corona Borealis (constellation)
coronagraph
coronal condensation
coronal hole
coronal lines
coronal loop
coronal mass ejection
coronal rain
coronal streamer
coronary angiography
coronary artery
coronary artery bypass grafting
coronary artery disease
coronary calcium scan
coronary microvascular disease
Coronas
COROT
co-rotation
Corporal (missile)
corrector plate
Corsa-A
Corsa-B
cortex
corticosteroid
corticotropin-releasing hormone
cortisone
Cortright, Edgar M. (1923-)
corundum
Corvus (constellation)
COS-B
COSETI
cosmic abundance
cosmic background radiation
cosmic catastrophes, biological effects
cosmic censorship
cosmic coincidences
cosmic collisions, biological effects
cosmic distance ladder
cosmic dust
cosmic infrared background
cosmic microwave background
cosmic rays
Cosmic Search magazine
cosmic string
cosmic X-ray background
cosmic year
cosmic-ray exposure age
cosmological constant
cosmological model
cosmological principle
cosmological redshift
COSMOLOGY
cosmology
cosmonaut
COSMONAUTS AND ASTRONAUTS
cosmos
Cosmos launch vehicle
Cosmos spacecraft
COSPAR (Committee on Space Research)
costal
cotyledon
coudé focus
Coulomb, Charles Augustin de (1736-1806)
coulomb
Coulomb barrier
Coulomb's law
countable set
countdown
counterfeir coin problem
couple
coupling constant
Courier
course correction
covalent bond
covalent crystal
covariance
cowling
Coxeter, Harold Scott MacDonald (1907-2003)
Coyne, George
CP violation
CPT theorem
crab
Crab Nebula (M1, NGC 1952)
CRAF (Comet Rendezvous/Asteroid Flyby)
cranial nerve
cranium
crater
Crater (constellation)
crater chain
CRATERS
crawler-transporter
crawlerway
creatine
Crescent Nebula (NGC 6888)
Cressida
Cretaceous period
Cretaceous-Tertiary Boundary
Crew Exploration Vehicle (CEV)
crew safety system (CSS)
Crick, Francis Harry Compton (1916-2004)
Crimean Astrophysical Observatory
Crippen, Robert Laurel (1937-)
critical angle
critical density
critical mass
critical point
critical temperature
Crocco, Gaetano Arturo (1877-1968)
Cromie, Robert (1856-1907)
Cros, Charles (1846-1888)
cross
cross range
cross-cutting
Crossfield, Albert Scott (1921-2006)
cross-linking
cross-section
crown glass
CRRES (Combined Release and Radiation Effects Satellite)
CRSP (Commercial Remote Sensing Program)
cruise missile
cruise phase
Cruithne (minor planet 3753)
crunode
crust
crustacean
Crux (constellation)
cryobiology
cryobot
cryogenic propellant
cryophiles
cryovolcanism
cryptarithm
cryptobiosis
cryptography
cryptovolcano
cryptozoology
crystal
crystal skulls
CS- (Communications Satellite)
Császár polyhedron
CT scanning
CTA102
CTIO
cube
cubewano
cubic curve
cubic equation
cubit
cuboctahedron
cuboid
CUFOS
Cullen number
culmination
cultural hurdle
Cunningham, R. Walter (1932-)
Cunningham chain
cup
Curie temperature
Curtis, Heber Doust (1872-1942)
curvature
curvature constant
curvature of field
curvature tensor
curve
curve of constant width
cusp
cute number
cuticle
cutoff
CW Leonis
cyanobacteria
cyanogen bands
Cybele group
cybernetics
cyborg
cyclic number
cyclic polygon
cycloid
Cyclops, Project
cyclotron
cyclotron radiation
16 Cygni
61 Cygni
Cygnus (constellation)
Cygnus A
Cygnus Loop
Cygnus X-1 (3U 1956+35)
cylinder
Cyrano de Bergerac (1619-1655)
cystic fibrosis
Cytherean
cytochromes
cytogenetic map
cytokinesis
cytoplasm
cytoplasm streaming
cytosine
cytoskeleton
cytosol
CZ (Long March)