NASA’s GRAIL mission is comprised of a pair of mirror-identical spacecraft to the Earth’s Moon to perform precision gravity measurements. This app describes the science of the GRAIL Mission, and features daily mission news updates, images of the spacecraft, videos, and a countdown timer to launch. Download the free app for iPhone, iPod touch, and iPad at https://itunes.apple.com/app/grail/id459858462?mt=8.

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