spacefaring
As a spacefarer, missions to the international space station do not satisfy the urge to explore the cosmos.
A spacefarer might leave Earth for a ten-year mission and return to discover that his twin had aged forty years.
It was a safety procedure that every spacefarer read about.

SMART Vocabulary: related words and phrases

Space travel
airlock
astronaut
astronautics
autopilot
biosatellite
blast
capsule
cosmonaut
escape velocity
EVA
flyby
launcher
rocket science
rocket scientist
space capsule
space probe
space shuttle
space tourism
space tourist
spacewalk