Space walk :  (noun)

1: any kind of physical activity outside a spacecraft by one of the crew

aerospace medicine, aerospace research, aerospace science, aerospace technology, astronautics, bioastronautics, break free, escape earth, escape velocity, go into orbit, grand tour, interplanetary travel, navigate in space, orbit the earth, park in space, rocketry, science fiction, shoot into space, space flight, space medicine, space travel, step flight, trip to Mars,