Astronauts who spacewalk outside the space shuttle and International Space Station can work for up to 7 hours in the current space suit, which is also called the Extravehicular Mobility Unit (EMU). The EMU is a marvel of technical achievement with a $12 million price tag. Despite the advanced technology of the EMU, the "mechanics" used to meet the astronaut's basic needs of food, water, and waste elimination are surprisingly "low tech."
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