![Since 2009, NASA's mission Operation IceBridge (OIB) has flown aircraft over the Antarctic Ice Sheet carrying laser and ice-penetrating radar instruments to collect data about the surface height, bedrock topography and ice thickness. Source http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4060](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/AA_bedrock_surface.4960.tif/lossy-page1-800px-AA_bedrock_surface.4960.tif.jpg)
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