NASA Astronaut Sunita Williams has returned to Earth after spending over 9 moths in space - under microgravity. Even though she is back, her body is yet to re-adjust to gravity. But there is another concern rising among experts - did she aged quickly at space?

Astronauts rely on advanced oxygen systems in space, with backup supplies ensuring survival in emergencies. If oxygen fails, astronauts use emergency tanks or return to the spacecraft. Life-support systems help maintain breathable air.