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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

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Kepler Discovers

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Pulverized Planet

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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....

At 3 p.m. EDT, NASA Television will air the edited video footage from STS-127 Solid Rocket Booster cameras.

Endeavour’s crew is enjoying off-duty time this afternoon before undertaking preparations for Wednesday’s third spacewalk. At 5:58 p.m. the crew will conduct a spacewalk procedure review and at 8:28 p.m. spacewalkers Dave Wolf and Chris Cassidy will camp out in the Quest Airlock. The International Space Station crew goes to sleep at 9:33 p.m., followed 30 minutes later by the shuttle crew.

Crews Tackle Robotics, Spacewalk Preparations

The combined efforts of the International Space Station and Space Shuttle Endeavour crews were successful in installing the Japanese Logistics Module-Exposed Section using two robotic arms.

Commander Mark Polansky and mission specialist Julie Payette operated the robotic arm aboard the space shuttle to pass the platform from Endeavour to Canadarm2 on the space station. Canadarm2 was operated by mission specialist Koichi Wakata and shuttle pilot Doug Hurley.

The Japanese Exposed Section was installed at about 9:30 a.m. The Japanese robotic arm on the station will be used Thursday to take experiments from that Exposed Section and install them on the new porch of the Kibo laboratory.

Astronauts Dave Wolf and Chris Cassidy began preparations for their spacewalk Wednesday, which is scheduled to begin at 9:58 a.m. Wolf and Cassidy changed out a series of spacesuit batteries to prepare for their spacewalk.

Tonight they will sleep in the airlock where they will adjust to a lower pressure, going from 14.7 psi to 10 psi, to adapt for the conditions in their spacesuit. This spacewalk will be the third spacewalk of the mission and will focus on the installation of four of the six Port 6 (P6) Truss batteries.

Polansky, Hurley, Payette and Wolf took time to answer questions posed by visitors on YouTube and Twitter. Polansky is providing regular updates on the mission’s progress from space via Twitter at

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