Astronaut tattoos mean courage and freedom. Astronauts are people who make space flight their profession or have flown in space. The criteria for determining space flight are not completely unified. In the United States, people who travel at an altitude of more than 80 kilometers (50 miles) above sea level are called astronauts.
Aerospace activity is a special professional activity. It has the characteristics of special working environment, highly complex vocational skills and arduous flight tasks. Every astronaut is brave and lonely. Just like people live their whole life, there is a long way to go, but there is light in their heart and they are not afraid of the distance.