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By in
on Sep 09, 2011

grail_launch_2_2011

Technicians work on the GRAIL craft after testing in a vacuum chamber in April 2011. Image Credit: NASA/JPL-Caltech/LMSS

Technicians work on the GRAIL craft after testing in a vacuum chamber in April 2011. Image Credit: NASA/JPL-Caltech/LMSS