The pain of the ISS astronaut when returning to Earth

The burning sensation of skin every movement is one of the biggest pain that Scott Kelly, astronaut has just returned to Earth after setting a record of 340 days in the universe, undergoing.

1. The astronaut's height increased by 5cm after a year of living on the universe

Scott is participating in the Twin Project of the US Aeronautics Agency (NASA), with his twin brother, Mark Kelly, former NASA astronaut. The project aims to assess the difference of twins after one year living in two different environments. While Scott operates in space, Mark is on Earth.

Scott Kelly has just returned to Earth after spending a year in space.(Photo: Reuters).

According to Telegraph, Scott Kelly is taller than her twin brother due to not being affected by gravity for a long time. Currently, Scott is a bit younger than Mark due to the " time dilation" effect in Albert Einstein's theory of relativity. However, his muscles and bones suffered many times more than the 159 days in the last flight into space.

At a press conference on March 1, Kelly said he had difficulties adjusting his life on Earth. In it, the most serious problem is that his skin becomes too sensitive. He felt like his skin was burning every time he sat or walked.

"I had the last flight within 159 days and when I came back, I found it quite good. But all problems started getting worse," Kelly said. He speculated that the state of sensitive skin was due to the reduced contact surface of the skin while on the International Space Station (ISS).

According to Kelly, the body adjusts itself to live in space more easily than on Earth. After returning to Earth, his height increased due to gravity, which caused the spine to stretch, but the result was temporary and Kelly returned to her previous height.

Kelly (right) is taller and younger than the twin brother on Earth.(Photo: NASA).

However, Kelly is younger than her younger brother because of the "elasticity time" effect , if two objects move at different speeds, time will drift faster with slower moving subjects. When in space, Scott moved faster than people on Earth, so he was about 1/100 second younger than Mark.

Medical examinations are still underway to find out the difference between the Kelly brothers' bodies. Thereby, scientists can better understand the effect of gravity on the human body.

Kelly shares every day in outer space very difficult, so he tried to create timelines to maintain the spirit.

"It is a harsh environment, you will never feel completely normal. If we intend to go to Mars, ISS is really an ideal place to study the living and living conditions of "People in space over a long period of time. It's almost like the Earth and orbits a great trajectory," Kelly said.