Astronomy
Articles about stars, planets, space and the universe.
Stephano (moon)
Stickney (crater)
Stickney Crater (Phobos)
Styx (moon)
Subaru Telescope
Subsolar point
Suisei
Summer solstice
Sun
Sun (Sol): The star at the center of the Solar System
Sunrise
Sunset
Sunspot
Super star cluster
Super-Earth
Super-Earth (exoplanet class)
Supercluster
Supercluster (large-scale cosmic structure)
Supergiant
Supermassive black hole
Supernova
Supernova: stellar explosions, types, and cosmic significance
A supernova is a catastrophic explosion that ends the life of certain stars. This article explains causes, types, observable features, historical examples, and their role in the co
Surface gravity
Surtur (moon)
Surtur (Saturn XLVIII) — moon S/2006 S 7
Suttungr (moon)
Suzaku (satellite)
Suzaku (ASTRO-EII) — Japanese X‑ray astronomy satellite
Sycorax (moon)
Synchronous orbit
Tadpole galaxy
Tadpole Galaxy (UGC 10214, Arp 188)
Taien calendar
Taiyo (satellite)
Tansei
Tansei — Japan's second artificial satellite
Tarantula nebula
Tarqeq (moon)
Tarvos (moon)
Tarvos (Saturnian moon)
Tatooine
Tatooine: Desert Planet and Cultural Setting in the Star Wars Galaxy
Tau Ceti
Taurus (astrology)
Taurus (astrology): the Bull — earth sign, fixed modality, ruled by Venus
Taurus (constellation)
Taurus (constellation): overview, notable objects, history and observing
Taygete (moon)
Telescope
Telescope: principles, history, types, and uses
Telescopium
Telesto (moon)
Tempel 1
Tempel 1 (9P/Tempel): discovery, Deep Impact encounter, and scientific legacy
Tenma
Tenma (ASTRO-B): Japan's second X‑ray astronomy satellite
Terraforming
Tethys (moon)
Tethys — Saturn's icy mid-sized moon
Thalassa (moon)
Thalassa — inner moon of Neptune
The Blue Marble
The Star
The Sun
The Sun: the star at the center of the Solar System
Thebe (moon)
Thelxinoe (moon)
Thelxinoe (Jupiter XLII): a small retrograde moon of Jupiter