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  • An artist's depiction of the twin spacecraft that comprise NASA's Gravity Recovery And Interior Laboratory (GRAIL) mission

    NASA's GRAIL Spacecraft In Science Collection Phase

    An artist's depiction of the twin spacecraft that comprise NASA's Gravity Recovery And Interior Laboratory (GRAIL) mission. During the GRAIL mission's science phase, spacecraft (Ebb and Flow) transmit...

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  • Artist's concept of NASA's twin GRAIL spacecraft

    GRAIL Spacecraft Over the Moon

    An artist’s depiction of the twin spacecraft (Ebb and Flow) that comprise NASA’s Gravity Recovery And Interior Laboratory (GRAIL) mission.

    NASA's Jet Propulsion Laboratory in Pasadena, Ca...

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  • Far side of the lunar surface, with Earth in the background

    MoonKAM Looks Homeward

    This image of the far side of the lunar surface, with Earth in the background, was taken by the MoonKAM system onboard the Ebb spacecraft as part of the first image set taken from lunar orbit from Mar...

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  • Far side of moon imaged by MoonKAM

    Far Side of Moon Imaged by MoonKAM

    This image of the lunar surface was taken by the MoonKAM system onboard the Ebb spacecraft on March 15, 2012. The 42.3-mile-wide (68-kilometer-wide) crater in the middle of the image (with the smaller...

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  • Artist's concept of GRAIL flying in formation

    GRAIL Flying in Formation (Artist's Concept)

    Using a precision formation-flying technique, the twin GRAIL spacecraft will map the moon's gravity field.

    The mission also will answer longstanding questions about Earth's moon, includin...

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  • Artist concept of GRAIL mission

    GRAIL mission

    Artist concept of GRAIL mission.

    Image credit: NASA/JPL-Caltech

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  • NASA's GRAIL twin spacecraft

    GRAIL on the Pad

    NASA's GRAIL twin spacecraft await launch atop a United Launch Alliance Delta II rocket at Cape Canaveral Air Force Station, Fla.

    Image credit: NASA/JPL-Caltech/United Launch Alliance, Th...

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  • Stages of pre-launch preparations of NASA's twin GRAIL spacecraft

    NASA's Twin GRAIL Spacecraft Are Ready For Launch

    These images show the various stages of pre-launch preparations of NASA's twin GRAIL spacecraft at Space Launch Complex 17B on Cape Canaveral Air Force Station in Florida.

    Image credit: N...

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  • GRAIL-A and GRAIL-B - completed their final inspections and were weighed one final time at the Astrotech Space Operations facility in Titusville, Fla.

    NASA's Grail-A spacecraft gets lifted in the cleanroom

    At Astrotech Space Operation's payload processing facility in Titusville, Fla., NASA's Gravity Recovery and Interior Laboratory-A (GRAIL-A) lunar probe is lifted from its workstand and across the clea...

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  • GRAIL artist's rendition

    GRAIL Artist's Rendition

    Using a precision formation-flying technique, the twin GRAIL spacecraft will map the moon's gravity field, as depicted in this artist's rendering. Radio signals traveling between the two spacecraft pr...

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  • GRAIL spacecraft aboard a U.S. Air Force C-17 Globemaster III

    NASA's Lunar Twins

    NASA's lunar twins arrive at Cape Canaveral, Fla. The two GRAIL spacecraft (GRAIL-A and GRAIL-B) made the trip from the Denver area to the Shuttle Landing Strip at the Kennedy Space Center, Fla. on Ma...

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  • Technicians prepare to hoist one of the two Grail spacecraft upon completion of a thermal vacuum test at the Lockheed Martin Space Systems facility in Denver.

    Testing the GRAIL Twins

    In the photo, taken April 29, 2011, technicians install lifting brackets prior to hoisting the 200-kilogram (440-pound) GRAIL-A spacecraft out of vacuum chamber after testing. Along with its twin GRAI...

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  • Engineers conducting checks

    Engineers Conducting Checks

    Engineers conduct checks on one of NASA's GRAIL spacecraft in the Space Support Building at Lockheed Martin Space Systems in Denver.

    Image credit: NASA/JPL/LockheedMartin

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