Related Sites

GRAIL Mission Site
Discovery Program

Eyes on the Solar System

Artist's concept of GRAIL mission

See GRAIL's current position and explore the mission in detail with NASA's Eyes on the Solar System 3D interactive.

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Visit the Eyes on the Solar System homepage to learn more.

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GRAIL iPhone App

GRAIL add for iPhone app

NASA’s GRAIL app has specific information about the science and purpose of the mission, and features daily mission news updates, images of the spacecraft during assembly and testing, videos and a countdown timer to launch.

› Download app

Mission News

Lunar Reconnaissance Orbiter Camera image shows the impact site of GRAIL A (Ebb spacecraft) before and after the spacecraft's descent to the lunar surface

Lunar Reconnaissance Orbiter Sees GRAIL's Explosive ...

NASA's Lunar Reconnaissance Orbiter spacecraft has imaged the final resting places on the moon of both of NASA's GRAIL spacecraft.

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Montage of our solar system

Moon, Mars Science Conference Events to Be Streamed

Science conference briefings to be held next week in Houston will be streamed live online.

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Still image from GRAIL animation with an inset photo of Sally Ride

NASA's GRAIL Lunar Impact Site Named for Sally Ride

NASA has named the site where twin agency spacecraft impacted the moon Monday in honor of the late astronaut Sally K. Ride, who was America's first ...

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Artist's concept of NASA's twin GRAIL spacecraft

NASA GRAIL Twins Complete Their Moon Impact

Engineers at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., have received confirmation that the twin GRAIL spacecraft have, as planned, ...

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Last flight for GRAIL's twin spacecraft

NASA to Provide Commentary as Grail Moon Mission Ends

NASA will provide live commentary of the scheduled lunar surface impacts of its twin Gravity Recovery and Interior Laboratory (GRAIL) spacecraft ...

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Latest Images

Ebb and Flow's Final Moments

These side-by-side, 3-D comparisons depict the unnamed lunar mountain targeted by the NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission for controlled impact of the Ebb and Flow spacecraft.

These side-by-side, 3-D comparisons depict the unnamed lunar mountain targeted by the NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission for controlled impact of the Ebb and Flow ...

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Lunar Heritage Sites and GRAIL's Final Mile

This graphic highlights locations on the moon NASA considers 'lunar heritage sites' and the path NASA's Gravity Recovery and Interior Laboratory spacecraft will take on their final flight.

This graphic highlights locations on the moon NASA considers "lunar heritage sites" and the path NASA's Gravity Recovery and Interior Laboratory spacecraft will take on their final flight. Navigators ...

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GRAIL's Final Resting Spot

These maps of Earth's moon highlight the region where the twin spacecraft of NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission will impact on Dec. 17, marking the end of its successful endeavor to map the moon's gravity.

These maps of Earth's moon highlight the region where the twin spacecraft of NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission will impact on Dec. 17, marking the end of its successful ...

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Last Flight for GRAIL's Twin Spacecraft

This still image and animation shows the final flight path for NASA's twin Gravity Recovery and Interior Laboratory (GRAIL) mission spacecraft, which will impact the moon on Dec. 17, 2012, around 2:28 p.m. PST.

This still image and animation shows the final flight path for NASA's twin Gravity Recovery and Interior Laboratory (GRAIL) mission spacecraft, which will impact the moon on Dec. 17, 2012, around ...

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Mapping Lunar Highlands

This graphic depicting the bulk density of the lunar highlands on the near and far sides of the moon was generated using gravity data from NASA's GRAIL mission and topography data from NASA's Lunar Reconnaissance Orbiter.

This graphic depicting the bulk density of the lunar highlands on the near and far sides of the moon was generated using gravity data from NASA's GRAIL mission and topography data from NASA's Lunar ...

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View Archives

Mission Extras

  • Technicians lift one of two GRAIL spacecraft to a test stand

    Grail Image Gallery

    › View Gallery
  • Launch pad

    Test Your Knowledge

    Find out if you've got the right stuff to plot the course for future space missions.

    › Take the Quiz
  • Rocket Science 101

    Rocket Science 101

    Assemble a Delta II, Delta IV, Atlas V or Pegasus rocket from main engine to payload fairing!

    › Build a Rocket

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