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scott1
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Two identical satellites, collectively known as the Gravity Recovery and Climate Experiment, or Grace, travel one behind the other in a polar orbit separated by about 130 miles.
http://www.nytimes.com/2006/08/08/s...1980f607&ei=5090&partner=rssuserland&emc=rss"Grace recorded a sudden drop in gravity near the quake’s epicenter off Sumatra.
How is it possible to have a drop in gravity when a Earth quake happens?
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