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As Major Tim Peake becomes the first official British astronaut to carry out a spacewalk, we find out more about the history of the space suit, which has changed a great deal over the years. Chris Riley, a science historian and professor of science and media at the University of Lincoln, says that the spacesuit is absolutely necessary. (Photo: Japan Aerospace Exploration Agency astronaut Aki Hoshide, takes a selfie self portrait during a spacewalk in 2012. Credit: AP)