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astronaut
astronautics
astronavigation
astronomical
astronomical clock
astronomical telescope
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astronomy
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astrodynamics
as·tro·dy·nam·ics [ àstrō dī námmiks ]


noun 
Definition:
 
study of motion in space: the study of the effects of gravitational and other forces on the motion of natural and artificial bodies in outer space ( takes a singular verb )


as·tro·dy·nam·ic adjective
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