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.
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.
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.
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.
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.
Dec. 21, 1999
Chandra x-ray data from stellar explosions.
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.
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."
March 24, 1999
Specially made photographic emulsions, made by NASA scientists, assist in advanced studies of fusion research at Lawrence Livermore Laboratory.
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.