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Labor Day Weekend for Astronauts: Space Toilet Cleaning and Exercise

Labor Day Weekend for Astronauts: Space Toilet Cleaning and Exercise
American astronauts Doug Wheelock, Tracy Caldwell Dyson (center) and Shannon Walker, all NASA spaceflyers and Expedition 24 flight engineers, pose for a photo with an American flag while aboard the International Space Station during their summer 2010 mission. (Image credit: NASA)

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Mike Wall
SPACE.COM SENIOR SPACE WRITER — Michael has been writing for Space.com since 2010. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.