Pick a flower on Earth and you move the farthest star. Paul A. M. Dirac (1902–1984)
Gravity and Magnetics
This gravity anomaly map shows where the Earth’s gravity field differs from a simplified model that assumes the Earth is perfectly smooth and featureless. Gravity anomalies are often due to unusual concentrations of mass in a region. For example, the presence of mountain ranges will cause the gravitational force to be stronger than it would be on a featureless planet — yielding a positive gravity anomaly. Positive anomalies are coloured yellow, orange, or red. Conversely, the presence of ocean trenches or even the depression of the landmass that was caused by the presence of glaciers millennia ago can cause negative gravity anomalies. Negative anomalies are coloured in shades of blue.
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University of Texas, Center for Space Research and NASA
