Wikipedia:Main Page history/2013 June 28

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Jürgen Ehlers

Jürgen Ehlers (1929–2008) was a German physicist who contributed to the understanding of Albert Einstein's theory of general relativity. From graduate and postgraduate work in Pascual Jordan's relativity research group at Hamburg University, he held academic posts before joining the Max Planck Institute for Astrophysics in Munich as a director. In 1995, he became the founding director of the newly created Max Planck Institute for Gravitational Physics (Albert Einstein Institute) in Potsdam, Germany. Ehlers' research focused on the foundations of general relativity as well as on the theory's applications to astrophysics. He formulated a suitable classification of exact solutions to Einstein's field equations and proved the Ehlers-Geren-Sachs theorem that justifies the application of simple, general-relativistic model universes to modern cosmology. He created a spacetime-oriented description of gravitational lensing and clarified the relationship between models formulated within the framework of general relativity and those of Newtonian gravity. He had a keen interest in the history and philosophy of physics and was an ardent popularizer of science. (Full article...)

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From Wikipedia's newest content:

The London England Temple at Newchapel in the Surrey district of Tandridge

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  • ... that EA Sports put its Fight Night boxing video game series on hiatus to develop their upcoming mixed martial arts game, EA Sports UFC?
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  • ... that West Indies cricket star Garfield Sobers outraged supporters in 1970 by playing in Rhodesia?
  • In the news

  • Tsakhiagiin Elbegdorj is reelected as President of Mongolia.
  • The Cambodian Tailorbird, found in Phnom Penh, is identified as a new bird species.
  • Kevin Rudd (pictured) wins leadership of the Australian Labor Party, ousting incumbent Julia Gillard and becoming Prime Minister of Australia.
  • The United States Supreme Court decides that portions of the Defense of Marriage Act, limiting federal benefits to opposite-sex marriages, are unconstitutional.
  • The Emir of Qatar Sheikh Hamad bin Khalifa Al Thani formally hands power to his son Tamim bin Hamad Al Thani.
  • In ice hockey, the Chicago Blackhawks defeat the Boston Bruins to win the Stanley Cup.

    Recent deaths: Mick Aston Bobby Bland

  • On this day...

    June 28

    An alto saxophone

  • 1846 – Belgian clarinetist Adolphe Sax received a patent for the saxophone (alto saxophone pictured).
  • 1914Archduke Franz Ferdinand of Austria and his wife, Sophie, Duchess of Hohenberg, were assassinated by Yugoslav nationalist Gavrilo Princip during a motorcade in Sarajevo, sparking the outbreak of World War I.
  • 1950Korean War: South Korean military and police summarily executed at least 100,000 suspected North Korean sympathizers.
  • 1967 – Israel annexed East Jerusalem, having captured it from Jordan in the Six-Day War.
  • 1981 – Seventy-three leading officials of Iran's Islamic Republic Party were killed when a bomb exploded at the party's headquarters in Tehran.

    More anniversaries: June 27 June 28 June 29

    It is now June 28, 2013 (UTC) – Reload this page
  • Today's featured picture

    Whistler's Mother

    Arrangement in Grey and Black No.1, better known as Whistler's Mother, is an 1871 oil-on-canvas painting by American artist James Abbott McNeill Whistler. It depicts the artist's mother, Anna McNeill, and was painted in London. The work, which measures 144.3 cm × 162.4 cm (56.8 in × 63.9 in), is now displayed at the Musée d'Orsay in Paris. It has been described as a Victorian Mona Lisa.

    Painting: James Abbott McNeill Whistler

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