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In a Thursday, April 12, 2018 photo, astronaut candidate Zena Cardman gets suited up for training in NASA's neutral buoyancy laboratory, in Houston. Space Center U is a challenging five-day program offered year-round to students so they can experience what training to be an astronaut might be like. (Brett Coomer/Houston Chronicle via AP)

In a Thursday, April 12, 2018 photo, astronaut candidate Zena Cardman gets suited up for training in NASA's neutral buoyancy laboratory, in Houston. Space Center U is a challenging five-day program offered year-round to students so they can experience what training to be an astronaut might be like. (Brett Coomer/Houston Chronicle via AP)

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