Source: wikipedia

09-19-2008 09:35

Extra-vehicular activity (EVA) is work done by an astronaut away from the Earth and outside of a spacecraft.

The term most commonly applies to an EVA made outside a craft orbiting Earth (a spacewalk) but also applies to an EVA made on the surface of the Moon (a moonwalk).

In the later lunar landing missions (Apollo 15, 16, and 17) the command module pilot did an EVA to retrieve film canisters on the return trip; he was assisted by the lunar module pilot who would perform a stand up EVA. These trans-Earth EVAs were the only spacewalks ever conducted in deep space to date.

 

Editor:Liu Fang