You can not walk in space because of lack of friction and
gravity.
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Chris Hadfield was the first Canadian to do a space walk.
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No, he was the first American to walk in space, Soviet cosmonaut Aleksei Leonov was the first person to walk in space.
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A "space walk" does not refer to actual walking. Extra-Vehicular
activity, or space walk, refers to work being done by an astronaut
outside of the spacecraft.
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The First American to perform a space walk was Ed White.