astronaut, person trained to travel in spacecraft, astronomy, study of space, astonimcal, extremely large amount, astrobiologist, a person who studies life beyond earth, astrophotography, taking pictures of space objects, astronautics, technology related to space travel, astroachaeology, study of astronomical technique used by ancient civilizations, astronmer, expert in astronomy, astrogeology, the study of the geology of solid bodies in the solar system, astronavigation, determining the course of a space craft by observing stars and space objects

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