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A spacesuit is all that stands between an astronaut on a space walk and the emptiness of space. It must supply all his or her needs. There is no breathable atmosphere in space so a spacesuit supplies oxygen to the astronaut. Within the helmet, headphones and a microphone enable the astronaut to communicate with crew members and mission control. All the joints in the spacesuit must be absolutely airtight. Inside the suit is pressurized like a deep-sea diver's suit. The visor and outer layer of the suit must be tough enough not to be torn or cracked by tiny meteorites that may bounce off the astronaut. A specially treated dark visor protects the astronaut's eyes from the glare of the Sun, while lights can illuminate dark areas.
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As well as supplying air to breathe, space suits have to remove moisture breathed out by the astronaut, so the clear face-place of the suit is not misted up by the cold of space.
resources: Tell me why (Chancellor Press)
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image 2: http://www.spacekids.co.uk/spacesuits/images/diagram.gif
