July 31, 1999
NASA's lunar orbiter collided with The MoonSaturday morning, July 31, 1999, at 0952 GMT
July 30, 1999
While professionals watch for a nearly transparent cloud of water vapor, amateurs will monitor the Moon's south pole for visible signs of Lunar Prospector's crash.
July 29, 1999
Using an experimental autopilot system, NASA's exotic Deep Space 1spacecraft has completed the closest-ever flyby of an asteroid.
July 28, 1999
Lunar Prospector has survived the July 28 partial Lunar Eclipseand is on track for a planned collision with The Moonon July 31. This story includes a video clip of the eclipse as seen from Australia and new simulations of the July 31 impact.
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.
July 26, 1999
This Wednesday's partial Lunar Eclipseposes a last-minute threat to Lunar Prospector, which is scheduled three days later to crash into The Moonin search of water.
July 23, 1999
Blame Newton and Kepler: Chandra's beautiful early morning launch will place it into an orbit unlike that of NASA's other Great Observatories.
July 22, 1999
By comparing several techniques and combining aspects of a couple of the best, scientists better predict the Sun's weather. Solar Weatheraffects our weather, satellites in orbit, electrical power systems, and radio and television communications.
July 22, 1999
Planetary scientists have developed the Torino Scale, a new means of conveying the risks associated with Asteroidsand Cometsthat might collide with the Earth.
July 21, 1999
Professional and amateur astronomers are preparing to observe The Moonon July 31st when Lunar Prospector plunges into a permanently shadowed crater in