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  • 18 Apr 2000

    Gamma ray scientists are losing observing time on another orbiting observatory. Last month, NASA announced it would destroy the 10-year-old Compton Gamma Ray Observatory due to faulty gyroscopes (Science, 31 March, p.

  • 17 Apr 2000

    To the surprise of many astronomers, Andromeda has been dethroned as the heftiest galaxy in the Local Group, our immediate neighborhood in the universe, which contains some 30 galaxies.

  • 17 Mar 2000

    Astronomy lovers can help the pros shed more light on gamma ray bursts, titanic explosions in the distant universe that cause short, intense bursts of gamma radiation.

  • 16 Feb 2000

    The most popular theory about how the moon formed--as a result of an apocalyptic collision between Earth and another object--always seemed to have a fatal flaw: It couldn't explain the moon's strange, tilted orbit. Now, planetary scientists say that may not be a problem at all.

  • 10 Feb 2000

    The Japanese-American x-ray satellite ASTRO-E burned up in the atmosphere Wednesday night, according to the Japanese Institute for Space and Astronautical Science (ISAS) in Kanagawa.

  • 9 Feb 2000

    Europe's new orbiting x-ray observatory made its public debut today. At a press conference in Villafranca, Spain, the European Space Agency released pictures of supernova remnants in the Large Magellanic Clouds and the chemical makeup of a nearby x-ray star.

  • 18 Jan 2000

    NASA may soon deliberately crash a scientific satellite into the ocean. The reason?

  • 13 Jan 2000

    ATLANTA--For 40 years, astronomers have been baffled by a faint glow of x-rays lighting up the entire sky. Now they think they have solved the mystery of the glow's origins.

  • 12 Jan 2000

    ATLANTA--Scientists have long been fascinated by the idea that the first life-forms on Earth could have been deposited on our planet after arising somewhere else in the solar system.

  • 29 Nov 1999

    Scientists today announced the detection of six new planets outside our solar system, bringing the total to 28. All the new planetary systems, to be described in an upcoming issue of Astrophysical Journal, have much more elliptical orbits than the planets in our solar system.