Jan. 22, 1999
Using a propulsive tether concept, spacecraft may be able to brake or boost their orbits without using onboard fuel. A NASA/Marshall project, named "ProSEDS," is slated to demonstrate braking, by accelerating an expended rocket toward re-entry.
June 3, 1999
Amateur astronomers around North America captured striking videos of The Moonas it eclipsed the bright star Regulus on May 21.
May 5, 1999
This morning NASA's Galileo spacecraft zoomed past Jupiter's moon Callisto. The maneuver was designed to bring Galileo closer to Jupiterin preparation for a daring encounter with a volcano on Io.
Feb. 17, 1999
Recent discoveries of Pluto-like objects in the outer solar system have sparked debate about the nature of the tiniest "planet."
Oct. 20, 1999
Scientists have different ideas to explain the behavior of Soft Gamma Repeaters (SGRs). SGR's irregularly give off short blasts of radiation in the gamma ray frequencies. Magnetar theory gives an explanation, but other theories depend on the surrounding stellar environment as well as a central neutron star.
Jan. 13, 1999
NASA and educators join for a hands-on experiment designed for students of all ages to investigate life in extreme environments and to learn about the possibilities for life elsewhere in the Solar System. The program, called "Life on the Edge," begins later this month when a dogsled team will transport a collection of extreme-loving microorganisms to the summit of one of the highest mountain peaks in North America.
Feb. 2, 1999
The Galileo spacecraft executed a close flyby of Jupiter's moon Europa this weekend. Recent images strengthen the evidence for a liquid ocean beneath Europa's frozen crust and reveal new surface features in 3D.
May 18, 1999
Several southern hemisphere telescopes observe the latest optical counterpart to a gamma-ray burst reported by BATSE and Beppo-Sax. Scientists estimate the burst originated 10 billion light years away.
July 20, 1999
Dying magnetars, supernovae, and the future of the universe are on tap for NASA's Chandra X-ray Observatory, scheduled for launch July 20, 12:39 a.m. EDT.
Aug. 10, 1999
North Americans could experience unusual shadow effects near sunrise on Aug. 11.