Gradual Development of Spacesuits
To explore space, astronauts must take optimum life support system with them as space is hostile to support life system. Inside the spacecraft, the atmosphere can be controlled so that special clothing is not needed. But in order to work outside the spacecraft in the harshest of environment, astronauts need the protection of a spacesuit. A fully equipped modern spacesuit is similar to a one-person spacecraft. Russia, USA and China are the only three countries to send human in space by their own. Modern day spacesuits are results of long term researches by different countries independently.