NASA selected Morgan to join its 21st astronaut class in August 2013. He launched to the space station aboard a Soyuz MS-13 spacecraft on July 20, 2019, the same day as the 50th anniversary of the Apollo 11 Moon landing, from the Baikonur Cosmodrome in Kazakhstan. Morgan served as a flight engineer on International Space Station Expeditions 60, 61, and 62, contributing to hundreds of scientific experiments, technology demonstrations, and space station maintenance activities. He traveled over 115 million miles (about 185 million km) while completing more than 4,300 Earth orbits over the course of his mission. During his nine months aboard the station, Morgan conducted seven spacewalks for a total of 45 hours and 48 minutes of spacewalking time, breaking the record for a single spaceflight by a U.S. astronaut. Four of his spacewalks were dedicated to repairing the Alpha Magnetic Spectrometer, a particle physics detector designed to search for evidence of antimatter and dark matter.