Astronaut Chris Hadfield on a mission STS-100 spacewalk

Canadian Space Agency astronaut Chris Hadfield stands on the portable foot restraint (PFR) connected to Canadarm on Space Shuttle Endeavour during one of two spacewalks (also known as EVAs or extravehicular activities) of mission STS-100. Astronaut Scott Parazynski, who shared both spacewalks with Hadfield and who took this photo, can be seen in the reflection on Hadfield's visor. (Credit: NASA)