This NASA TV video grab shows US astronaut Kate Rubins viewed near the docking port on August 19, 2016 at the International Space Station. AFP / NASA TV / Lizabeth MENZIES
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That's because Acaba is afraid of heights.Acaba was making his first public appearance – on the ground – since his Feb. 28 return from the space station.Acaba, who has logged more than 300 days in space on three separate flights, said space travel for private citizens is closer than many think.The goal is to get to Mars in the 2030 time frame and to the moon before that, he said.Acaba took off on Expedition 53-54 with a crew of Russian colleagues on Sept. 13, 2017 .
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