Astronomy
Articles about stars, planets, space and the universe.
Exploration of Mars
Exploration of Neptune
Extinction (astronomy)
Extragalactic astronomy
Extrasolar planet
Extrasolar planet (exoplanet)
Extraterrestrial sky
Extraterrestrial sky: appearance, causes, and observed examples
Extravehicular activity
Extravehicular activity (EVA): spacewalks, suits, history and uses
Farbauti (moon)
Fenrir (moon)
Fenrir (moon) — an irregular outer satellite of Saturn
Ferdinand (moon)
Fermi paradox
Fermi paradox: the puzzle of the Great Silence
First light (astronomy)
Flame nebula
Flame Nebula (NGC 2024) — emission and star-forming nebula in Orion
Flamsteed designation
Flare star
Flare star: magnetic outbursts on cool, active stars
Fleming (lunar crater)
Flora family
Flora family (asteroid group)
Fobos-Grunt
Fobos-Grunt: Russian Phobos sample-return mission (2011)
Formation and evolution of the Solar System
Former constellations
Fornax
Fornax (constellation)
Fornjot (moon)
Fornjot (Saturn XLII) — an irregular outer moon of Saturn
Francisco (moon)
Francisco (Uranian moon)
Frankfurt Universe
From the Earth to the Moon
Full Moon
G-type main-sequence star
G-type Main-Sequence Star (Yellow Dwarf)
Gaia (spacecraft)
Gaia (ESA space observatory)
Galactic plane
Galactic quadrant
Galatea (moon)
Galaxy
Galaxies: structure, classification, dark matter, and cosmic distribution
Overview of galaxy structure and morphology, the roles of stars, gas and dominant dark matter, central black holes, and how galaxies are organized from dwarf systems to clusters ac
Galaxy cluster
Galaxy cluster — structure, formation, and cosmological significance
Galaxy group
Galaxy Science Fiction
Galilean moons
Galileo (spacecraft)
Gamma Cygni
Gamma Cygni (Sadr): a bright supergiant in the Cygnus constellation
Gamma Tauri
Gamma Tauri (Prima Hyadum)
Gamma Velorum
Gamma Velorum (Regor) — Massive binary in Vela
Gamma-ray burst
Ganymede (moon)
Gas giant
Gegenschein
Gegenschein (Counterglow): Faint Antisolar Sky Glow
Gemini (astrology)
Gemini (astrology): The Twins — mutable Air sign ruled by Mercury
Gemini is the third sign of the Western zodiac, symbolized by the Twins. Associated with Mercury and the element Air, it spans late May to late June in common tropical practice.
Gemini (constellation)
Geocentrism
Geometric albedo
Geometric albedo: definition, measurement, and significance