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  • Look at that Sunspot Go!

    Nov. 12, 1999

    On Monday afternoon, November 15, the planet Mercury will pass in front of the Sun creating a speedy dark spot on our star that can be seen through properly filtered telescopes.

  • Materials Science101

    Sept. 15, 1999

    So you're a PhD scientist or a top gun pilot, and you've just been selected to be an astronaut, and now you have to learn to be a generalist to help run experiments on the International Space Station(ISS). So it's back to school for astronaut trainees, too.

  • MeteorsDown Under

    May 3, 1999

    On May 6th debris from Halley's comet will strike Earth's atmosphere and put on a sky show for southern observers. The eta Aquarid meteor display is the first of two upcoming annual showers caused by the famous comet.

  • Astrobiologists To Hunt Small Game in Siberia

    July 27, 1999

    NASA and Russian scientists are setting out to Siberia to hunt small game, microbes whose life styles may hold clues to the possibilities for life elsewhere in the solar system. Their trek is part of NASA's Astrobiologyprogram.

  • Next stop: the stars

    Feb. 12, 1999

    NASA's next Great Observatory, the Chandra x-ray telescope, moved one step closer to launch this week after being installed in a clean room for final tests and other work at the Kennedy Space Center.

  • Prospecting inside a Supernova

    Dec. 21, 1999

    Chandra x-ray data from stellar explosions.

  • Space Stationglovebox ready for scientists to start designing experiments

    Sept. 14, 1999

    A versatile experiment facility for the International Space Stationmoved closer to flight recently with delivery of the ground-test model to NASA's Marshall Space Flight Center.

  • Here Comes the Blue Moon

    March 30, 1999

    The second Blue Moon of 1999 takes place this Wednesday night. This article explains how to see it and explores the history of the expression "Blue Moon."

  • Old photographic technique applied to future energy research

    March 24, 1999

    Specially made photographic emulsions, made by NASA scientists, assist in advanced studies of fusion research at Lawrence Livermore Laboratory.

  • Fading embers hold clues to puzzle of gamma-ray bursts

    Sept. 10, 1999

    Sometimes the big fireworks aren't the whole show. Watching the embers fade away can help you understand what was hidden by a blinding flash of light - or gamma rays. In a paper accepted for publication in Astrophysical Journal Letters, astrophysicists report that an afterglow can start during a gamma-ray burst, thus suggesting that more than one activity is causing what appears to be a chaotic explosion.