Tom Wagner, ICESat-2 Program Scientist, NASA Headquarters, left, and Doug McLennan, ICESat-2 Project Manager, NASA's Goddard Space Flight Center, are seen during a NASA Ice, Cloud and land Elevation Satellite-2 (ICESat-2) prelaunch briefing, Thursday, Sept. 13, 2018, at Vandenberg Air Force Base in California. The ICESat-2 mission will measure the changing height of Earth's ice. Photo Credit: (NASA/Bill Ingalls)
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