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A model of the 70-metric-ton configuration of the SLS rocket, designed to carry the Orion spacecraft, is tested in the Trisonic Wind Tunnel at NASA's Marshall Space Flight Center, on August 23, 2012. This view uses special cameras and a deflection of light (Schlieren flow visualization) directed through the windows in the tunnel to show the shadows of airflow as it changes angles at high speeds, helping visualize the various intense pressures of atmosphere on the model. (Photo by NASA/MSFC)
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