SUMMARY: NASA and the German Center for Air and Space Flight successfully launched the Gravity Recovery and Climate Experiment, or "Grace" today. The twin-satellite mission lifted off on Sunday from Russia's Plesetsk Cosmodrome on board a Rockot launch vehicle. Once in their final orbit, the satellites will separate to a distance of 220km apart, and will begin producing a high-definition gravity map of the Earth's surface to help scientists understand some of the factors that affect climate change.
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