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Gravity: It's What Keeps Us Together
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1 Oct 2014 NASA Mission Points to Origin of 'Ocean of Storms' on Earth's Moon
Using data from NASA's Gravity Recovery and Interior Laboratory (GRAIL), mission scientists have solved a lunar mystery almost as old as the moon itself. Early theories suggested the craggy outline of a region of the moon's surface known as Oceanus Procellarum, or the Ocean of Storms, was caused by an asteroid impact. If this theory had been correct, the basin it formed would be the largest asteroid impact basin on the moon. However, mission scientists studying GRAIL data believe they have found evidence the craggy outline of this rectangular region -- roughly 1,600 miles (2,600 kilometers) across -- is actually the result of the formation of ancient rift valleys.
29 May 2014 NASA Missions Let Scientists See Moon's Dancing Tide From Orbit
Scientists combined observations from two NASA missions to check out the moon's lopsided shape and how it changes under Earth's sway -- a response not seen from orbit before. The team drew on studies by NASA's Lunar Reconnaissance Orbiter, which has been investigating the moon since 2009, and by NASA's Gravity Recovery and Interior Laboratory, or GRAIL, mission. Because orbiting spacecraft gathered the data, the scientists were able to take the entire moon into account, not just the side that can be observed from Earth.
30 May 2013 NASA'S GRAIL Mission Solves Mystery of Moon's Surface Gravity
NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission has uncovered the origin of massive invisible regions that make the moon's gravity uneven, a phenomenon that affects the operations of lunar-orbiting spacecraft. Because of GRAIL's findings, spacecraft on missions to other celestial bodies can navigate with greater precision in the future.
10 Dec 2012 NASA's GRAIL Creates Most Accurate Moon Gravity Map
Twin NASA probes orbiting Earth's moon have generated the highest resolution gravity field map of any celestial body. The new map, created by the Gravity Recovery and Interior Laboratory (GRAIL) mission, is allowing scientists to learn about the moon's internal structure and composition in unprecedented detail. Data from the two washing machine-sized spacecraft also will provide a better understanding of how Earth and other rocky planets in the solar system formed and evolved.
29 May 2012 GRAIL Completes Primary Mission
A NASA mission to study the moon from crust to core has completed its prime mission earlier than expected. The team of NASA's GRAIL mission, with twin probes named Ebb and Flow, started extended science operations on Aug. 30 and will continue through Dec.

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Last Updated: 12 Sep 2014