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Sloshing in Space: Wild Astronaut Video Shows Weightless Fluid Flow

Water's odd behavior in weightlessness comes under scrutiny in a new European Space Agency video, which shows an astronaut spinning small jars of liquid for science.

Astronaut Thomas Pesquet recorded the video in the International Space Station's Kibo laboratory as part of a "voluntary science" experiment that astronauts do outside of normal working hours. The French astronaut spins in circles with first one, then two jars; close-ups show the water slowly sloshing inside, and bubbles forming.

"Here I recorded some video of water in these tanks as it moves about inside; the technical term is sloshing," Pesquet said in a statement accompanying the video. [Fun in Zero-G: Weightless Photos from Earth and Space]

"How fluids behave is hard to model in computers and predict ... but we need this information to build better spacecraft tanks to use every last drop and increase their working life," he added.

The experiment, called SPHERES-Slosh, was previously performed on the space station using volleyball-size autonomous robots that can fly in formation. Pesquet did the experiment again after the researchers saw some "surprising results," European Space Agency officials said in the statement, although they did not specify what those results were.

Pesquet, a member of the Expedition 51 crew, has been on board the International Space Station since November. He has performed one spacewalk, and regularly posts updates on his spaceflight on his Twitter account.

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Elizabeth Howell

Elizabeth Howell is a contributing writer for who is one of the few Canadian journalists to report regularly on space exploration. She is the author or co-author of several books on space exploration. Elizabeth holds a Ph.D. from the University of North Dakota in Space Studies, and an M.Sc. from the same department. She also holds a bachelor of journalism degree from Carleton University in Canada, where she began her space-writing career in 2004. Besides writing, Elizabeth teaches communications at the university and community college level, and for government training schools. To see her latest projects, follow Elizabeth on Twitter at @howellspace.