Craft To Target Moon’s Gravity | Chemical & Engineering News
Volume 89 Issue 35 | p. 26 | Concentrates
Issue Date: August 29, 2011

Craft To Target Moon’s Gravity

Department: Government & Policy
News Channels: Analytical SCENE
Keywords: moon, gravity, GRAIL, NASA
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Technicians complete a thermal vacuum test on one of the NASA GRAIL spacecraft.
Credit: NASA/JPL - Caltech/LMSS
Technicians prepare to hoist one of the two NASA GRAIL spacecraft upon completion of a thermal vacuum test at the Lockheed Martin Space Systems facility in Denver.
 
Technicians complete a thermal vacuum test on one of the NASA GRAIL spacecraft.
Credit: NASA/JPL - Caltech/LMSS

A pair of spacecraft, set for launch aboard the same rocket on Sept. 8, will head for the moon to study its gravity. NASA’s Gravity Recovery & Interior Laboratory (GRAIL) mission aims to assemble the most detailed map ever of the moon’s gravitational field. Such a map will allow scientists to glean information about the moon’s interior structure and composition and the evolution of its magnetism. Additionally, the data will provide insights into the moon’s heating and cooling history, as well as information about the moon’s origin. The two spacecraft will spend several months adjusting their orbits to fly in formation, one following the other. The differences in the moon’s gravity, produced by different densities and amounts of terrain, will cause the spacecraft to move toward or away from each other. The distance changes can then be translated into gravitational changes.

 
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