Phil Morton, NASA GRACE-FO project manager at Jet Propulsion Laboratory discusses the Gravity Recovery and Climate Experiment Follow-On mission during a prelaunch media briefing at Vandenberg Air Force Base May 21, 2018,in Lompoc, California. The twin GRACE-FO spacecraft will measure changes in how mass is redistributed within and among Earth's atmosphere, oceans, land and ice sheets, as well as within Earth itself.

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