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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....

Launch preparations are under way at NASAs Kennedy Space Center in Florida following Wednesdays successful test fueling of space shuttle Endeavours external tank.

Two previous attempts to launch Endeavour on the STS-127 mission were halted by a leak in the area of the Ground Umbilical Carrier Plate, which attaches a gaseous hydrogen vent line to the external tank. After several days of investigation and repair work, the massive orange tank was filled with liquid hydrogen and liquid oxygen as controllers watched for evidence of leaks. The system performed well, verifying the success of the repair.

There were absolutely no leak indications whatsoever noted on the two leak detectors, said Launch Director Pete Nickolenko. We will continue to look at the data, and our next step is to move toward launch.

Endeavours astronauts are taking the holiday weekend off and will go into quarantine Sunday evening. They are due to arrive at Kennedy on July 7 at 2 p.m. EDT. The countdown will officially begin Wednesday at 10 p.m. when clocks begin ticking backward from T-43 hours. Liftoff is set for July 11 at 7:39 p.m.

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