FILE - Jared Isaacman, left, and Hayley Arceneaux prepare to head to launchpad 39A for a launch on a SpaceX Falcon 9 at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday Sept. 15, 2021. New research presents the largest set of information yet regarding how the human body reacts to spaceflight. (AP Photo/John Raoux, File)