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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 Tom Marshburn wrapped up a six hour, 53 minute spacewalk at 6:20 p.m. EDT.

Wolf and Marshburn completed most of their planned tasks, deferring a video camera setup to a future spacewalk. Wolf removed three hardware spares – a Ku-Band Space-to-Ground Antenna, a Pump Module and a Linear Drive Unit, from the Integrated Cargo Carrier – Vertical Light Deployable (ICC-VLD). With each spare in hand, Wolf rode the space station robotic arm from the ICC to the Port 3 external stowage platform (ESP-3), where he and Marshburn attached them for long-term storage. Julie Payette and Doug Hurley operated the robotic arm. Marshburn mounted a grapple bar onto an ammonia tank assembly so that the STS-128 space shuttle mission in August can move the tank by robotic arm. Marshburn also attached two insulation sleeves for the Station to Shuttle Power Transfer System.

This was the second of five STS-127 spacewalks, the 127th in support of International Space Station assembly and maintenance, totaling 792 hours, 31 minutes. It was the 215th American spacewalk in history. It was Wolf’s sixth spacewalk, totaling 38 hours, 44 minutes and placing him 19th on the all-time list. It was Marshburn’s first excursion.

NASA Television airs a Mission Status briefing at 8:30 p.m. with STS-127 Lead Flight Director Holly Ridings and STS-127 Lead Extravehicular Activity Officer Kieth Johnson.

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