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< astronomical year astrophotography >
as·tron·o·my audio (-strn-m) KEY
NOUN:
pl. as·tron·o·mies
1. The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena.
2. A system of knowledge or beliefs about celestial phenomena: the various astronomies of ancient civilizations.
ETYMOLOGY:
Middle English astronomie, from Old French, from Latin astronomia, from Greek astronomi : astro-, astro- + -nomi, -nomy
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