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This Nov. 13, 2013 photo made available by NASA shows the Robonaut with legs at a lab in Houston. Each leg, 4 feet, 8 inches long when straight, has seven joints. Instead of feet, there are grippers. Each gripper, or foot, has a light, camera and sensor for building 3-D maps. (AP Photo/NASA, Bill Stafford, James Blair)
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FILE - In this undated illustration made available by NASA, dust scatters light during the lunar sunset as the Lunar Atmosphere and Dust Environment Explorer (LADEE) orbits the moon. On Friday, April 18, 2014, flight controllers confirmed that the orbiting spacecraft crashed into the back side of the moon as planned, just three days after surviving a full lunar eclipse, something it was never designed to do. During its $280 million mission, LADEE identified various components of the thin lunar atmosphere — neon, magnesium and titanium, among others — and studied the dusty veil surrounding the moon, created by all the surface particles kicked up by impacting micrometeorites. (AP Photo/NASA, Dana Berry)
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In this Aug. 20, 2013 photo provided by NASA, engineers prepare to install the Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft into the fairing of the Minotaur V launch vehicle nose-cone at NASA's Wallops Flight Facility in Wallops Island, Va. On Friday, April 18, 2014, flight controllers confirmed that the orbiting spacecraft crashed into the back side of the moon as planned, just three days after surviving a full lunar eclipse, something it was never designed to do. During its $280 million mission, LADEE identified various components of the thin lunar atmosphere — neon, magnesium and titanium, among others — and studied the dusty veil surrounding the moon, created by all the surface particles kicked up by impacting micrometeorites. (AP Photo/NASA, Terry Zaperach)
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In this artist's concept provided by NASA, the Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft orbits the moon. Flight controllers on Friday, April 18, 2014 confirmed that the orbiting spacecraft crashed into the back side of the moon as planned, just three days after surviving a full lunar eclipse, something it was never designed to do. (AP Photo/NASA, Dana Berry)
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In this artist's concept provided by NASA the Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft is seen orbiting the moon as it prepares to fire its maneuvering thrusters to maintain a safe orbital altitude. NASA's small moon-orbiting spacecraft LADEE (pronounced LAH'-dee) is no more. Flight controllers confirmed early Friday April 18, 2014 that LADEE crashed into the back side of the moon. (AP Photo/NASA, Dana Berry) Credit: NASA Ames / Dana Berry ----- What is LADEE? The Lunar Atmosphere and Dust Environment Explorer (LADEE) is designed to study the Moon's thin exosphere and the lunar dust environment. An "exosphere" is an atmosphere that is so thin and tenuous that molecules don't collide with each other. Studying the Moon's exosphere will help scientists understand other planetary bodies with exospheres too, like Mercury and some of Jupiter's bigger moons. The orbiter will determine the density, composition and temporal and spatial variability of the Moon's exosphere to help us understand where the species in the exosphere come from and the role of the solar wind, lunar surface and interior, and meteoric infall as sources. The mission will also examine the density and temporal and spatial variability of dust particles that may get lofted into the atmosphere. The mission also will test several new technologies, including a modular spacecraft bus that may reduce the cost of future deep space missions and demonstrate two-way high rate laser communication for the first time from the Moon. LADEE now is ready to launch when the window opens on Sept. 6, 2013. Read more: http://www.nasa.gov/ladee <b><a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html"rel="nofollow">NASA image use policy.</a></b> <b><a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a></b> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a lea
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This artist's rendering provided by NASA on Thursday, April 17, 2014 shows an Earth-sized planet dubbed Kepler-186f orbiting a star 500 light-years from Earth. Astronomers say the planet may hold water on its surface and is the best candidate yet of a habitable planet in the ongoing search for an Earth twin. (AP Photo/NASA Ames, SETI Institute, JPL-Caltech, T. Pyle)
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This artist's rendering provided by NASA on Thursday, April 17, 2014 shows an Earth-sized planet dubbed Kepler-186f orbiting a star 500 light-years from Earth. Astronomers say the planet may hold water on its surface and is the best candidate yet of a habitable planet in the ongoing search for an Earth twin. (AP Photo/NASA Ames, SETI Institute, JPL-Caltech, T. Pyle)
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FILE - This Jan. 12, 2013 photo provided by NASA shows the SpaceX Dragon vehicle inside a processing hangar at Cape Canaveral Air Force Station in Cape Canaveral, Fla. SpaceX has scheduled another launch attempt Friday, April 18, 2014 to the International Space Station. NASA confirmed the launch date Wednesday, April 16, 2014, two days after a last-minute rocket leak delayed the delivery mission. Stormy weather, however, is forecast Friday. Saturday is the backup launch date. (AP Photo/NASA, Kim Shiflett)
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In this photo provided by NASA, astronaut Rick Mastracchio works to replace a pump in a spacesuit, Monday, April 14, 2014, aboard the International Space Station. SpaceX called off a launch to the space station on Monday, April 14, 2014, because of a rocket leak. Officials said they believe the problem can be fixed by Friday, the next opportunity for flying and the last chance before astronauts do urgent spacewalking repairs. (AP Photo/NASA)
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In this image made available from a video by NASA TV shows the SpaceX Falcon rocket on the launch pad at the Cape Canaveral Air Force Station, Fla., Monday, April 14, 2014. The unmanned SpaceX rocket carries the Dragon capsule, which is full of supplies and is expected to dock with the International Space Station later this week. (AP Photo/NASA TV)
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FILE - This Tuesday, March 26, 2013 file photo provided by NASA shows the release of the SpaceX Dragon-2 spacecraft from the International Space Station. NASA is pressing ahead, on Monday, April 14, 2014, with the planned launch of a supply ship despite a critical computer outage at the International Space Station, promising the situation is safe. (AP Photo/NASA)
