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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....

Spacewalkers Dave Wolf and Chris Cassidy wrapped up a five-hour, 59-minute spacewalk at 4:31 p.m. EDT. The spacewalk ended earlier than planned because of higher than normal carbon dioxide levels in Cassidy's spacesuit.

The pair removed multilayer insulation from the Kibo module and readied the Japanese Exposed Section payloads for their transfer to the Exposed Facility on Thursday, but they were unable to replace all six of the original batteries on the International Space Station's Port 6 truss 2B power channel. The remaining batteries will be replaced on a future spacewalk.

This was the third of five STS-127 spacewalks, the 128th in support of International Space Station assembly and maintenance, totaling 798 hours, 30 minutes. It was the 100th spacewalk out of space station airlocks and the 216th American spacewalk in history. It was Wolf's seventh spacewalk, totaling 41 hours, 57 minutes and placing him 14th on the all-time list. It was Cassidy's first excursion.

NASA Television airs a Mission Status briefing at 7:30 p.m. with STS-127 Lead Flight Director Holly Ridings and STS-127 Lead Spacewalk Officer Kieth Johnson.

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