|  |  | Shuttle Imaging RadarLaunches: November 12, 1981; October 5, 1984; April 9, 1994; September 30, 1994; February 11, 2000
		
			This series of missions flown on NASA's Space Shuttle over two decades pioneered imaging radar, a technology that uses radar pulses to capture images of Earth. After two missions in the 1980s, projects in 1994 and 2000 added new radar frequencies and a second antenna to measure Earth's topography.
 
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