NASA astronaut Megan McArthur, right, and NASA astronaut Shane Kimbrough greet family members after leaving the operations and checkout building before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (Photo by John Raoux/AP Photo)
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