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Advances in instrumentation and navigation technology have brought airborne gravimetry, the measurement of Earth's gravitational field strength using instruments aboard aircraft, to an unprecedented 1-2 milligal level of accuracy today. This means that scientists can now use aircraft to map tiny gravity changes that are 1 million times smaller than 1 g0 (standard gravity), allowing them to make detailed maps of buried resources and enabling high-precision geodetic applications. [Source: EOS: Earth & Space Science News]
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