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Two NASA astronauts, Sunita Williams and Butch Wilmore, spent over nine months in space. They were supposed to stay for only eight days, but their spacecraft had problems. So, they stayed on the International Space Station (ISS) much longer than planned.  
When they finally came back to Earth, their bodies felt different. Being in space for so long made their muscles weak and their bones thinner. This happened because there is no gravity in space to keep their muscles and bones strong. Their hair even looked different! Some parts turned gray, which surprised many people. Being in space for so long can make astronauts age faster in some ways.  
Now, the astronauts have to exercise a lot and eat healthy foods to feel strong again. They are doing special training for 45 days to help their bodies get used to being on Earth. Scientists are learning a lot from their trip. It will help us understand how to keep astronauts healthy on longer missions, like going to Mars!