spacewalker

noun

1. An astronaut engaging in a space walk or other activity outside the spacecraft.

   “NASA has spacewalkers periodically look at their gloves, since the discovery of a cut in a glove used by an astronaut during the last shuttle mission.”

   “Mr. Clooney, as a veteran spacewalker, with his resonant voice and folksy yarns, seems to be channeling every imperturbable astronaut you ever heard speaking from on high.”