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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 Tom Marshburn and Chris Cassidy conducted a four-hour, 54-minute spacewalk and completed the mission’s work on the outside of the Japanese Kibo laboratory Monday.

The pair installed video cameras on the front and back of the new Japanese Exposed Facility. The cameras will provide views to help with rendezvous and berthing of the H-II Transfer Vehicle scheduled to make its first deliveries to the International Space Station in September.

Marshburn and Cassidy also completed miscellaneous tasks around the station. They secured multi-layer insulation around the Special Purpose Dexterous Manipulator known as Dextre, split out power channels for two space station Control Moment Gyroscopes, tied down some cables and installed handrails and a portable foot restraint to aid future spacewalkers. The deployment of the Payload Attach System on the S3 Truss was deferred to another spacewalk sometime in the future.

The shuttle and station crews will awaken around 3 a.m. EDT Tuesday to prepare for undocking. They will bid each other farewell and close the hatches at 10:23 a.m., followed by undocking at 1:26 p.m.

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