Curious Kids: Do Astronauts Get Space Sick on the Way to the International Space Station?

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights.

This is an article from Curious Kids, a series for children. The Conversation is asking kids to send in questions they'd like an expert to answer. All questions are welcome – serious, weird or wacky!

This is a great question. If any of the students of class 3E get the opportunity to fly in space, just slap on an anti-nausea skin patch and go for it! Space sickness discomfort is real but if it happens to you, it will be short and you will remember the space voyage experience forever.

Yes, astronauts can get space sick travelling to the International Space Station. It is less likely travelling in the cramped Russian Soyuz spacecraft used to transport astronauts there now, than the old Space Shuttle that was used until 2011. The ability to move around in the Space Shuttle increased the chance of space sickness happening. Space sickness affects up to half of the astronauts during their first few days on the space station.

The idea of an astronaut barfing into their space helmet sounds funny, or embarrassing, at first. However, as astronaut Mike Mullane has said in his biography, it could be fatal - particularly if the astronaut was spacewalking. The vomit could smear the inside of the helmet, blinding the astronaut. And because it could not be removed, it could be inhaled or clog their oxygen circulation system.

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What causes space sickness?

As you probably know, gravity is lower inside the International Space Station. Gravity is the force that pulls us down to the ground. The low gravity in space allows astronauts to float around, which looks very fun, but it can help cause space sickness.

Space sickness is nausea and disorientation felt by many astronauts. NASA uses the term "space adaptation syndrome" instead of space sickness. It more closely describes the problem because it is an issue of the astronaut struggling to adapt to weightlessness in space. The cause of space sickness is still not fully understood.

Recent experiments show that space sickness is related to our inner ear. Two separate parts of the inner ear respond to rotation and sudden changes in direction. If you shake or move your head very quickly, you can get dizzy and some people may even feel sick. However, this normally passes very quickly.

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This normal response is upset under low gravity - your inner ear thinks you are constantly moving. It takes some time to adapt to the new condition of weightlessness. It is made worse if you move your head while your body is still adapting. This is why previous astronauts travelling in the larger Space Shuttle were prone to space sickness more than the current astronauts travelling in the cramped Soyuz spacecraft – because in a confined space, the astronauts were less likely to move their heads around very much.

Space sickness was not talked about in the early space missions. The original Mercury and Gemini spacecraft were, like the current Soyuz, cramped. It wasn't until the Apollo and later missions that space sickness became of concern to NASA.

In 1983 the first detailed study was carried out aboard a Space Shuttle flight (STS-7) by astronaut-doctor Norm Thagard. His and all later studies were hampered by the astronauts themselves. None of them wanted to admit to being space sick. They were worried that mission control might remove them from space walking opportunities, or even worse, that they might not get included on later space missions.

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Kevin Orrman-Rossiter, PhD Research Student, History & Philosophy of Science, University of Melbourne

This article was originally published on The Conversation. Read the original article. Follow all of the Expert Voices issues and debates — and become part of the discussion — on Facebook, Twitter and Google +. The views expressed are those of the author and do not necessarily reflect the views of the publisher. This version of the article was originally published on Space.com .