Astronomy
Articles about stars, planets, space and the universe.
Themis (hypothetical moon)
Themis (hypothetical moon of Saturn)
Themisto (moon)
Themisto — a small prograde moon of Jupiter
Thrymr (moon)
Thyone (moon)
Thyone (Jupiter XXIX): an irregular, retrograde moon of Jupiter
Tidal locking
Tidal locking: gravitational synchronization of rotation and orbital motion
Titan (moon)
Titan (moon of Saturn)
Titan Lake In-situ Sampling Propelled Explorer
TALISE — Titan Lake In-situ Sampling Propelled Explorer
Titania (moon)
Titania — largest moon of Uranus
Trans-Neptunian object
Transit of Venus
Transit of Venus: rare planetary crossing of the Sun
Transiting Exoplanet Survey Satellite
Transiting Exoplanet Survey Satellite (TESS)
Triangulum
Triangulum (constellation)
Triangulum Australe
Triangulum Australe (Southern Triangle)
Triangulum galaxy
Triangulum Galaxy (M33)
Trifid nebula
Trifid Nebula (M20): Overview, Structure, and Observing Guide
Triton (moon)
Trojan asteroid
Tucana
Tucana (constellation)
TV Geminorum
TV Geminorum — a large red giant star in Gemini
Tyche (planet)
Tyche — hypothetical gas giant proposed in the Solar System's Oort cloud
Tycho's Supernova
U Lacertae
UDFj-39546284
UDFj-39546284: candidate for one of the earliest observed galaxies
Ulysses (spacecraft)
Umbriel (moon)
Unidentified flying object
Unidentified flying object (UFO)
Universe
An accessible overview of the Universe: its contents, large-scale structure, origin, observation methods, and major unresolved questions in modern cosmology.
Uranus
Uranus — the Ice Giant of the Solar System
Uranus is the seventh planet from the Sun, an ice giant with a tilted axis, faint rings, many moons and a cold methane-rich atmosphere. Voyager 2 remains the only spacecraft to vis
Uranus in fiction
Ursa Major
Ursa Major: The Great Bear constellation and the Big Dipper
Ursa Minor
Ursa Minor: the Little Bear and the Little Dipper
UY Scuti
V-type asteroid
V-type asteroid (Vestoid)
V382 Carinae
V509 Cassiopeiae
V838 Monocerotis
Valles Marineris
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Van Allen radiation belt
Variable nebula
Variable star
Vega
Vega (Alpha Lyrae): a nearby bright star, rapid rotator and debris-disk system
Vela (constellation)
Venera
Venera: Venus and the Soviet Venera spacecraft program
Venus
Venus — the second planet and Earth's often-contrasted sibling
Verona Rupes
Very Large Telescope
Very Large Telescope (VLT) — ESO's flagship optical observatory
Viking program
Viking program (NASA Mars missions)