Gamma-ray spectrometer prompts researchers to rethink how Mercury formed

April 17, 2015 1:20 PM

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A versatile instrument developed by Lawrence Livermore National Laboratory (LLNL) scientists and riding on the first spacecraft to ever orbit Mercury is causing researchers to rethink their theories on the planet's formation.

Known as the Gamma-Ray Spectrometer, or GRS, the instrument is part of a suite of seven instruments onboard NASA's Mercury MESSENGER (short for MErcury Surface, Space ENvironment, GEochemistry and Ranging) spacecraft.

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