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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....

NASA has signed a $36.9 million contract modification to space shuttle main engine manufacturer Pratt & Whitney Rocketdyne of Canoga Park, Calif., to provide continued shuttle main engine prelaunch and launch support from April 1 through July 31.

The contract modification also provides two additional options that if exercised, would bring the potential contract amount for all six months to $56 million.

This modification supports the flyout of the Space Shuttle Program and brings the total potential value of the contract to $2.29 billion. The original contract began on Jan. 1, 2002.

The majority of the work will take place at Pratt & Whitney Rocketdyne's headquarters in Canoga Park.

Three main engines and two solid rocket boosters provide the thrust to launch the space shuttle. At 14-feet long and seven-and-a-half feet in diameter at the nozzle exit, the liquid propellant main engines have a combined thrust of more than 1.2 million pounds.

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