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This undated image made available by NASA shows an artist's rendering of the Space Launch System. Still in development, the super-sized rocket is meant to eventually send astronauts to Mars. On Friday, May 12, 2017, NASA said its 2019 test flight will fly without a crew. (NASA via AP)

This undated image made available by NASA shows an artist's rendering of the Space Launch System. Still in development, the super-sized rocket is meant to eventually send astronauts to Mars. On Friday, May 12, 2017, NASA said its 2019 test flight will fly without a crew. (NASA via AP)

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