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astronautics
astronavigation
astronomical
astronomical clock
astronomical telescope
astronomical twilight
astronomical unit
astronomical year
astronomy
astrophotography
astrophysics
AstroTurf
astute
astylar
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Asunción
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astrogeology
as·tro·ge·ol·o·gy [ àstrō jee ólləjee ]


noun 
Definition:
 
extraterrestrial geology: the study of the origin, history, and structure of cosmic bodies other than Earth

as·tro·ge·ol·o·gist noun
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