Astronauts’ brains don’t fully adapt to life in microgravity, new study finds

Astronauts' brains never fully adjust to weightlessness despite spending months in space, causing them to grip objects as if they were as heavy as on Earth. A study of 11 International Space Station crew members found they moved slower and gripped more firmly than necessary in microgravity, suggesting decades of Earth gravity create permanent neural patterns that provide safety margins but may pose challenges for future Mars missions.