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How an astronaut's 'right stuff' has changed over the years

What makes a good astronaut? The attributes have evolved since NASA first vetted candidates in the 1950s, space policy fellow George Abbey tells National Geographic. For today's missions, like NASA’s Artemis program — which aims to establish a long-term presence on the lunar surface — the psychological effects of isolation and the dynamics of teamwork will be even more critical to consider when selecting astronaut crews. Read more here.