As 35-mph winds blow through a wind tunnel, Research Aerospace Engineer David Chan, left, holds a wand that emits smoke fluid to collect data on air flow around the 6-foot SLS Exploration Mission 2 vehicle model at NASA Langley Research Center on Friday, May 5, 2017. The procedure simulates a launch and helps prevent complications like the rocket from making contact with the tower. (Aileen Devlin/Daily Press) MORE PHOTOS VIDEO
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