NASA Spacecraft Achieves Unprecedented Success Studying Mercury via NASA http://t.co/6TVzK2iJ5v: NASA Spacecra... http://t.co/NAskT3Xvf5

NASA Spacecraft Achieves Unprecedented Success Studying Mercury via NASA http://t.co/6TVzK2iJ5v: NASA Spacecra... http://t.co/NAskT3Xvf5

— John Prieto (@prietoj) April 16, 2015

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April 16, 2015 at 12:41PM

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