Why the astronaut suit? After being in a space ship, it's protected by its walls, and doors tightly closed. Nevertheless, before space flight reliability of the suit carefully checked. In space can occur for many unexpected: suddenly rethermalized ship or it would hit the meteorite, all the air will instantly disappear, and the astronaut will become unbearable. While the suit has a large supply of air. In addition, it is heated from the inside, and the astronaut no cold is not terrible. And if the astronaut performs work outside the spacecraft, then the suit is simply necessary. Indeed, in the open space can be very hot or very cold. And if, viewing the ship or conducting external monitoring, astronaut too removed from the station, with the help of the suit, which provides the radio, he will be able to communicate with friends, remaining on Board the space station or on the Ground.