Summary:
- Two NASA astronauts, Kjell Lindgren and Bob Hines, are returning to Earth after spending nearly a year aboard the International Space Station (ISS).
- Spending extended periods in microgravity can have significant effects on the human body, including muscle and bone loss, changes in the cardiovascular system, and vision problems.
- NASA closely monitors the health of its astronauts during and after long-duration spaceflight missions to better understand the impacts and develop countermeasures to mitigate the effects.