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Triton

Triton is the largest moon of the planet Neptune, discovered on October 10, 1846, by William Lassell. It is the only large moon in the Solar System with a retrograde orbit, which is an orbit in the opposite direction to its planet's rotation. At 2700 km in diameter, it is the seventh-largest moon in the Solar System. Because of its retrograde orbit and composition similar to Pluto's, Triton is thought to have been captured from the Kuiper belt. Triton consists of a crust of frozen nitrogen over an icy mantle believed to cover a substantial core of rock and metal. The core makes up two-thirds of its total mass. Triton has a mean density of 2.061 g/cm3 and is composed of approximately 15–35% water ice. Triton is one of the few moons in the Solar System known to be geologically active. As a consequence, its surface is relatively young, with a complex geological history revealed in intricate and mysterious cryovolcanic and tectonic terrains. Part of its crust is dotted with geysers believed to erupt nitrogen. (more...)

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From Wikipedia's newest content:

St Mary's Church in Hampden Park, Eastbourne, seen from the south

  • ... that the bombed-out St Mary's Church in Hampden Park, East Sussex, was replaced by "one of Edward Maufe's most charming designs" (pictured)?
  • ... that in August 1990 FC Bayern Munich lost in the first round of the cup at amateur side FV 09 Weinheim?
  • ... that French Napoleonic General François-Xavier Donzelot showed his appreciation for the return of his library by the British by reserving a seat at his table for any captured British officer?
  • ... that Tropical Storm Greta was described as a "bomb that did not explode"?
  • ... that most of the provisions of Alabama HB 56, considered the toughest anti-illegal immigration law in the United States, recently went into effect after surviving a legal challenge?
  • ... that fairyflies include the smallest known insects, smaller than a single-celled Paramecium?
  • In the news

    Ellen Johnson Sirleaf

  • Ellen Johnson Sirleaf (pictured), Leymah Gbowee, and Tawakel Karman share the Nobel Peace Prize for their efforts to advance women's rights.
  • Tomas Tranströmer becomes the 108th winner of the Nobel Prize in Literature.
  • Apple Inc. co-founder Steve Jobs dies at the age of 56.
  • Dan Shechtman wins the Nobel Prize in Chemistry for his discovery of quasicrystals.
  • Russia restores the full satellite constellation of global satellite navigation system GLONASS.
  • On this day...

    October 8: Yom Kippur ends at nightfall (Judaism, 2011); Independence Day in Croatia (1991);

    Gustav Mahler

  • 451 – The Council of Chalcedon, the fourth ecumenical council in Christianity, opened. It repudiated the Eutychian doctrine of monophysitism, and set forth the Chalcedonian Creed.
  • 1076Demetrius Zvonimir, the last native king who exerted any real power over the entire Croatian state, was crowned.
  • 1897 – Composer Gustav Mahler (pictured) was appointed the director of the Vienna Court Opera.
  • 1967Marxist revolutionary and guerrilla leader Che Guevara was captured near La Higuera, Bolivia.
  • 2001 – At Linate Airport in Milan, Italy, Scandinavian Airlines Flight SK686 collided on take-off with a Cessna Citation II business jet, killing 118 people.
  • More anniversaries: October 7 October 8 October 9

    It is now October 8, 2011 (UTC) – Refresh this page
    Jesse Jackson in 1983

    Jesse Jackson (seen here in 1983) is an African American civil rights activist and Baptist minister. Jackson came to prominence with the Southern Christian Leadership Conference, working closely with Martin Luther King, Jr., but he clashed with King's successor Ralph Abernathy and left the organization to form Operation PUSH. Jackson was unsuccessful in both his 1984 and 1988 attempts to win the Democratic presidential nomination. Since then, he has remained active in the African American community and is seen by many as one of America's most important black leaders.

    Photo: Warren K. Leffler, USN≀ Restoration: Fletcher

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