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Taking more than 70 million observations during its first 2 years in orbit, a limousine-length satellite has given scientists their most detailed map yet of Earth's gravitational field. The lumpiness of that geoid-the theoretical surface that a planet-wide ocean would take if there were no tides or currents-betrays the irregularity of the planet's mass distribution, including concentrations of mass such as mountain ranges and ice sheets. [Source: ScienceNOW]
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