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Satellites are used for a large number of purposes. Common types include military (spy) and civilian Earth observation satellites, communication satellites, navigation satellites, weather satellites, and research satellites.

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NASA Probe Sees Solar Wind Decline

The 33-year odyssey of NASA's Voyager 1 spacecraft has reached a distant point at the edge of our solar system where there is no outward motion of solar wind. Now hurtling toward interstellar space some 17.4 billion...

Super-Earth Atmosphere

A team of astronomers, including two NASA Sagan Fellows, has made the first characterizations of a super-Earth's atmosphere, by using a ground-based telescope...

Kepler Discovers

NASA's Kepler spacecraft has discovered the first confirmed planetary system with more than one planet crossing in front of, or transiting, the same star...

Pulverized Planet

Tight double-star systems might not be the best places for life to spring up, according to a new study using data from NASA's Spitzer Space Telescope....

Dark Asteroids

NASA is set to launch a sensitive new infrared telescope to seek out sneaky things in the night sky -- among them, dark asteroids that could pose a threat to Earth....

Technicians in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida are making such good progress with X-ray type image scans of space shuttle Discovery's external fuel tank that they expect to finish the job today, a day ahead of schedule.

The team has been using a refined method of gathering the computed radiography scans of all 108 support beams, called stringers, on the outside of the external tank’s intertank section. The method has provided overlapping images, which has lowered the need to have scans retaken.

Engineers at other NASA locations are analyzing the new image scans, which began Sunday. The new data, along with previous testing and analysis, will help engineers and managers determine what caused small cracks on the tops of two stringers during Discovery’s launch countdown on Nov. 5.

Space Shuttle Program managers still are scheduled to decide Thursday afternoon whether testing and analysis indicate modifications are needed on some of the stringers. If required, modifications would begin next Monday

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