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Space Probe Gravity Models of Planets => Estimates of
Europa’s deep structure
From: NASA Galileo Jupiter Mission Images
High-Res. Regional Gravity Maps by Tandem Satellite Surveys
R. A. Kerr, Science 325, 798 (2009)
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Global Gravity Anomalies Reveal Deep Earth Structure & History
From: GRACE Mission; http://www.jpl.nasa.gov/news/features.cfm?feature=11