traveler, traveller - a person who changes location

spacewalker - an astronaut who is active outside a spacecraft in outer space

Armstrong, Neil Armstrong - United States astronaut; the first man to set foot on the moon (July 20, 1969) (1930-)

Gagarin, Yuri Alekseyevich Gagarin, Yuri Gagarin - Soviet cosmonaut who in 1961 was the first person to travel in space (1934-1968)

Glenn, John Glenn, John Herschel Glenn Jr. - made the first orbital rocket-powered flight by a United States astronaut in 1962; later in United States Senate (1921-)

Alan Bartlett Shepard Jr., Alan Shepard, Shepard - astronaut who made the first United States' suborbital rocket-powered flight in 1961 (1923-1998)

Tereshkova, Valentina Tereshkova, Valentina Vladmirovna Tereshkova - Soviet cosmonaut who was the first woman in space (born in 1937)