See how difficult it is to walk back to Earth from space

After returning to Earth, astronauts experience all kinds of symptoms from long stays in space, from lack of spatial awareness to muscle aches and increased skin sensitivity.

According to a recent video by astronaut Drew Feustel, one of these symptoms is the inability to walk in a straight line with closed eyes.

Vostel posted a video on his Twitter account after some of his colleagues returned to Earth from the International Space Station last Thursday and said in a commentary: "Welcome to the SoyuzS09!" On 5 October this is what I started as I walk foot in the foot with my eyes closed, After 197 days at the space station .. I hope the feeling of the newly returned crew will be much better. "

Vostel spent about 200 days in a labyrinthine environment inside the International Space Station, so it was understood that he might find it difficult to walk in a straight line once he returned to Earth.

Astronauts train for about two hours a day when they are in space with almost no gravity to maintain muscle mass and bone density, but that does not mean that it is easy for them to automatically walk upright by simply returning to Earth's gravity.

Back on Earth, astronauts must undergo a series of physical and medical tests to see how their bodies have survived in space.

This type of data is very important for NASA, which is preparing to send humans on longer missions in the solar system. Because sending humans to Mars requires scientists to understand exactly how the human body interacts with long-range space flights from weightlessness to exposure to radiation.

Long-term missions at the International Space Station - like astronaut Scott Kelly, who spent a year aboard the orbital station - are a key factor in understanding exactly what medical issues can do during trips to distant places in deep space.