Astronomy
Articles about stars, planets, space and the universe.
Invariable plane
Invariable plane of a planetary system
Io (moon)
Iocaste (moon)
Iocaste (Jupiter XXIV) — a small irregular moon of Jupiter
Iris nebula
Irregular galaxy
Isonoe (moon)
Isonoe: Jupiter's irregular retrograde moon in the Carme group
James Webb Space Telescope
James Webb Space Telescope (JWST)
Janus (moon)
Jarnsaxa (moon)
Jarnsaxa (Saturnian moon)
Jikiken
Jikiken — Japanese scientific satellite (launched 16 September 1978)
Jōkyō calendar
Jōkyō calendar (Jōkyō-reki): Japan's Edo-period lunisolar calendar
Julian day
Julian year
Juliet (moon)
Juliet (Uranian moon)
July 4
July 4 (date)
Juno (spacecraft)
Juno (NASA spacecraft) — Jupiter orbiter mission
Jupiter
Jupiter — the largest planet in the Solar System
Kale (moon)
Kale (Jupiter XXXVII): an irregular moon of Jupiter
Kallichore (moon)
Kallichore (Jupiter XLIV) — irregular moon of Jupiter
Kalyke (moon)
Kalyke (Jupiter XXIII): an irregular retrograde moon of Jupiter
Kari (moon)
Kari (moon) — Saturn XLV, an irregular retrograde satellite
Kármán line
Kármán line — boundary between Earth's atmosphere and outer space
Keck Observatory
W. M. Keck Observatory
Kepler (spacecraft)
Kepler-186f
Kepler-186f — an Earth-sized exoplanet in the habitable zone
Kepler-22b
Kepler-22b: a transiting exoplanet in the habitable zone of a Sun-like star
Kepler-438b
Kepler-452b
Kepler-62e
Kepler-62e — Super-Earth in the Habitable Zone of Kepler-62
Kepler-62f
Kepler-62f — potentially habitable super-Earth
Kepler's laws
Kepler's laws of planetary motion
Kepler's Supernova
Kerberos (moon)
Kirkwood gap
Kirkwood gaps
Kitt Peak National Observatory
Kiviuq (moon)
Kore (moon)
Kraken Mare
Kraken Mare — Titan's largest hydrocarbon sea
Kuiper belt
Kuiper Belt: the distant trans-Neptunian region of icy bodies
KW Sagittarii
KY Cygni
KY Cygni — a very large red supergiant in Cygnus
Kyokko
Kyokko — Japanese artificial satellite launched in 1978
La Silla Observatory
La Silla Observatory — ESO astronomical site in Chile
Lacerta
Lacerta (constellation)
Lagoon Nebula
Lagrange point
Lakes of Titan
Lalande 21185
Lalande 21185 — nearby red dwarf in Ursa Major