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How do astronauts in space go to the bathroom and take care of their personal hygiene?

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A. Astronauts brush their teeth just like they do on Earth. There is no shower on the orbiter, so astronauts must make do with sponge baths until they return home. Each Space Shuttle has a toilet that can be used by both men and women. Designed to be as much as possible like those on Earth, the units use flowing air instead of water to move waste through the system. Solid wastes are compressed and stored onboard, and then removed after landing. Wastewater is vented to space, although future systems may recycle it, such as they do on the International Space Station. The air is filtered to remove odor and bacteria and then returned to the cabin. more
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A. Astronauts brush their teeth just like they do on Earth. There is no shower on the Shuttle, so astronauts must make do with sponge baths until they return home. Each Space Shuttle has a toilet that can be used by both men and women. Designed to be as much as possible like those on Earth, the units use flowing air instead of water to move waste through the system. Solid wastes are compressed and stored onboard, and then removed after landing. Wastewater is vented to space, although future systems may recycle it, such as they do on the Space Station Mir. The air is filtered to remove odor and bacteria and then returned to the cabin. more
science.ksc.nasa.gov
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