The Crew-11 spaceflyers — NASA's Zena Cardman and Mike Fincke, Kimiya Yui of Japan and cosmonaut Oleg Platonov — splashed down off the coast of Long Beach, California early Thursday morning (Jan. 15). They then spent a day and night at a local medical facility before heading east to Texas.

A stronauts’ bodies undergo plenty of stress beyond just the extraordinary g-forces at launch. Microgravity, cosmic radiation, biological clock disruptions, and more all take a toll on space travelers. Now, new research is shedding light on how these invisible stressors can prematurely age astronauts—and how they can bounce back.

A SpaceX ship recovered the spacecraft from the ocean and at around 1:30 a.m. and welcomed aboard NASA astronauts Zena Cardman and Mike Fincke, plus Kimiya Yui of the Japan Aerospace Exploration Agency and Oleg Platonov of Roscosmos, the Russian space agency.

The biggest changes happen in brain regions involved with processing sensory information and coordinating movement, according to a new study