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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....

Space shuttle Endeavour is scheduled to land at Florida's Kennedy Space Center today with a touchdown at 10:48 a.m. EDT. The shuttle would begin its descent from orbit with a deorbit engine firing at 9:42 a.m. Weather conditions at Kennedy are forecast to be favorable for landing, although a slight chance of rain is possible.

A second opportunity exists for a landing in Florida today, beginning with a deorbit engine firing at 11:16 a.m., leading to a 12:22 p.m. touchdown. No other shuttle landing sites are being considered for a landing today. If weather prevents a landing today, alternate landing sites would be called up for Saturday’s landing opportunities.

Thursday, Endeavour Commander Mark Polansky and Pilot Doug Hurley checked out the systems the shuttle will use as it returns home, finding everything in excellent shape. The crew also deployed two pairs of small satellites from canisters in the shuttle’s payload bay.

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