Astronomy
Articles about stars, planets, space and the universe.
Comet Swift–Tuttle
Comet Swift–Tuttle (109P/Swift–Tuttle) — parent of the Perseid meteor shower
Comet West
Comet West (1975) — discovery, appearance and legacy
Comoving distance
Compact star
Conjunction (astronomy and astrology)
Constellation
Constellations: cultural meanings, history, and the 88 official star regions
Explore constellations: how cultures worldwide interpreted star patterns, their roles in myth and navigation, and the modern mapping that divides the sky into 88 official star regi
Cordelia (moon)
Cordelia (moon of Uranus)
Corona
Corona Australis
Corona Australis (Southern Crown)
Corona Borealis
Corona Borealis — the Northern Crown constellation
Coronagraph
COROT-7b
CoRoT-7b — a rocky exoplanet with an ultra-short orbital period
Corvus (constellation)
Corvus: the Raven constellation
Cosmic distance ladder
Cosmic dust
Cosmic dust: origin, composition, observations and role in planetary systems
Cosmic microwave background radiation
Cosmogony
Cosmology
Crab Nebula
Crab Nebula: Remnant of SN 1054 and its Pulsar
Crater (constellation)
Cressida (moon)
Crux
Cupid (moon)
Cupid (moon) — small inner satellite of Uranus
Curiosity rover
CW Leonis
CW Leonis (IRC+10216): a carbon-rich red giant star
Cybele asteroid
Cybele asteroids: the outer main-belt group beyond 3.27 AU
Cygnus (constellation)
Cygnus — the Swan: a northern constellation with the Northern Cross
Cygnus OB2
Cygnus X-1
Cyllene (moon)
Damocloid
Damocloid: dormant comet-like small bodies of the outer Solar System
Daphnis (moon)
Daphnis (moon of Saturn)
Dark energy
Dark Energy: The Mysterious Force Driving Cosmic Acceleration
Dark nebula
Dawn (spacecraft)
Day
Daylight saving time
De revolutionibus orbium coelestium
De revolutionibus orbium coelestium — Copernicus and the heliocentric work
Declination
Deep Impact (space mission)
Deep Impact (NASA comet impactor mission)
Deimos (moon)
Deimos — moon of Mars
Delphinus (constellation)
Delta Cephei
Delta Cephei: a fundamental Cepheid variable and distance calibrator
Delta II
Delta IV
Delta IV (Evolved Expendable Launch Vehicle)
Delta-v
Denpa (satellite)
Denpa: Japan's 1972 Radiation Research Satellite (REXS)
Desdemona (moon)
Desdemona (Uranian moon)