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Earth Resources 2 pilot at 65,000 feet over Alaska, USA, 2014. The Earth Resources 2 (ER-2) high-altitude aircraft was used to carry the MABEL (Multiple Altimeter Beam Experimental Lidar,) instrument to study glaciers and ice sheets. The pilots were Tim Williams (seen here), and Denis Steele. Earth Resources 2 pilot at 65,000 feet over Alaska, USA, 2014. Creator: Denis Steele. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)