Neptune Articles

• 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
• Pluto
  Kuiper Belt
  Extrasolar Planets
  Solar System
  Eris (Xena)
  Astronomy
   
  

  Definition of planet

  The definition of "planet" has for some time been the subject of intense debate. Although the word dates back thousands of years, no officially decreed scientific definition of "planet" existed ... > more
• Uranus
  Solar System
  Astronomy
  Pluto
  Jupiter
  Moon
   
  

  Uranus

  Uranus is the seventh planet from the Sun. It is a gas giant, the third largest by diameter and fourth largest by mass. NASA's Voyager 2 is the only spacecraft to have visited the planet and no other ... > more
• Kuiper Belt
  Pluto
  Eris (Xena)
  Solar System
  Astronomy
  Extrasolar Planets
   
  

  Eris (dwarf planet)

  Eris is the largest known dwarf planet in the solar system. It is a trans-Neptunian object (TNO), orbiting the Sun in a region of space known as the scattered disc, just beyond the Kuiper belt, and ... > 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
• 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
• 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
• Solar System
  Saturn
  Moon
  Pluto
  Jupiter
  Astronomy
   
  

  Saturn's natural satellites

  Saturn is currently known to have 56 moons, many of which were discovered very recently, and 3 additional un-confirmed, hypothetical moons. However, a precise number of moons can never be given, as ... > 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
• Jupiter
  Solar System
  Astronomy
  Space Exploration
  Space Probes
  Pluto
   
  

  Jupiter

  Jupiter is the fifth planet from the Sun and by far the largest within the solar system. Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon and Venus); however at ... > more

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