Saturn Articles

• Volcanoes
  Natural Disasters
  Sports Science
  Geology
  Global Warming
  Early Climate
   
  

  Volcano

  A volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, molten rock, ash, and gases to escape from deep below the surface. Volcanic activity involving the extrusion of ... > more
• Jupiter
  Solar System
  Moon
  Pluto
  Kuiper Belt
  Astronomy
   
  

  Jupiter's natural satellites

  Jupiter has 63 known natural satellites. Although claims are made for the observation of one of Jupiter's moons by Chinese astronomer Gan De in 364 BC, the first certain observations of Jupiter's ... > more
• Solar System
  Extrasolar Planets
  Kuiper Belt
  Pluto
  Astronomy
  Eris (Xena)
   
  

  Planet

  The International Astronomical Union defines "planet" as a celestial body that, within the Solar System that is in orbit around the Sun; has sufficient mass for its self-gravity to overcome rigid ... > more
• Mars
  Solar System
  Astronomy
  Asteroids, Comets and Meteors
  Space Exploration
  Extrasolar Planets
   
  

  Extraterrestrial life

  Extraterrestrial life is life that may exist and originate outside the planet Earth, the only place in the universe currently known by humans to support life. Its existence is currently purely ... > more
• Stars
  Galaxies
  Astronomy
  Extrasolar Planets
  Sun
  Cosmic Rays
   
  

  Alpha Centauri

  Alpha Centauri (α Cen / α Centauri) is the brightest star system (a triple star system) in the southern constellation of Centaurus, and contains the fourth brightest star in the night ... > more
• Solar System
  Astronomy
  Pluto
  Sun
  Asteroids, Comets and Meteors
  Solar Flare
   
  

  Solar System

  The Solar System consists of the Sun and the other celestial objects gravitationally bound to it: the eight planets, their 165 known moons, three dwarf planets (Ceres, Pluto, and Eris and their four ... > more
• Mercury
  Solar System
  Astronomy
  Sun
  Extrasolar Planets
  Pluto
   
  

  Mercury (planet)

  Mercury is the innermost and smallest planet in the solar system, orbiting the Sun once every 88 days. It ranges in brightness from about −2.0 to 5.5 in apparent magnitude, but is not easily ... > more
• Mars
  Solar System
  NASA
  Space Missions
  Space Exploration
  Astronomy
   
  

  Phobos (moon)

  Phobos is the larger and innermost of Mars' two moons, and is named after Phobos, son of Ares (Mars) from Greek Mythology. Phobos orbits closer to a major planet than any other moon in the solar ... > more
• Pluto
  Kuiper Belt
  Solar System
  Neptune
  Jupiter
  Astronomy
   
  

  Pluto

  Pluto, designated (134340) Pluto, in the Minor Planet Center catalogue, is the second-largest known dwarf planet in the solar system. It orbits between 29 and 49 AU from the Sun, and was the first ... > more
• Asteroids, Comets and Meteors
  Astronomy
  Solar System
  Sun
  Solar Flare
  Space Exploration
   
  

  Comet

  A comet is a small body in the solar system that orbits the Sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail - both primarily from the effects of solar radiation upon the ... > more

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