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Home First image from a test of the radar instrument on NASA’s Soil Moisture Active Passive satellite Feb. 27-28, 2015. The test was performed with SMAP’s antenna in a non-spinning mode, which limits measurement swath widths to 25 miles (40 kilometers). (NASA/JPL-Caltech; NASA Goddard Space Flight Center) First image from a test of the radar instrument on NASA's Soil Moisture Active Passive satellite Feb. 27-28, 2015. The test was performed with SMAP's antenna in a non-spinning mode, which limits measurement swath widths to 25 miles (40 kilometers). (NASA/JPL-Caltech; NASA Goddard Space Flight Center)

First image from a test of the radar instrument on NASA’s Soil Moisture Active Passive satellite Feb. 27-28, 2015. The test was performed with SMAP’s antenna in a non-spinning mode, which limits measurement swath widths to 25 miles (40 kilometers). (NASA/JPL-Caltech; NASA Goddard Space Flight Center)

First image from a test of the radar instrument on NASA's Soil Moisture Active Passive satellite Feb. 27-28, 2015. The test was performed with SMAP's antenna in a non-spinning mode, which limits measurement swath widths to 25 miles (40 kilometers). (NASA/JPL-Caltech; NASA Goddard Space Flight Center)

First image from a test of the radar instrument on NASA’s Soil Moisture Active Passive satellite Feb. 27-28, 2015. The test was performed with SMAP’s antenna in a non-spinning mode, which limits measurement swath widths to 25 miles (40 kilometers). (NASA/JPL-Caltech; NASA Goddard Space Flight Center)

First image from a test of the radiometer instrument on NASA’s Soil Moisture Active Passive satellite Feb. 27-28, 2015. The test was performed with SMAP’s antenna in a non-spinning mode, which limits measurement swath widths to 25 miles (40 kilometers).  (NASA/JPL-Caltech; NASA Goddard Space Flight Center)