Extravehicular activity

Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a space suit for environmental support.

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Space suits are rated according to their purpose and complexity.

• Class I space suits are emergency protection against vacuum, but are not otherwise useful.
• Class II space suits are a reasonably light with limited EVA capabilities.
• Class III space suits add on armor protection.
• Class IV space suits are specified for military operation, combining armor, self-repair, tactical displays, and limited EVA capabilities.
• Class V space suits improve on Class IV. Little else is known of them.
• Class VI space suits are specified as combat armor, adding on significant bulk and useful in boarding operations.
• Class VII space suits improve on Class VI with heavy mechanisation to enable the wielding of heavy weapons.
• Class VIII space suits are intended for long-term operation in space, utilising a full Manned Maneuvering Unit.
• Class IX space suits are fully mechanised exosuits, including the Titan exosuit brand.