Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

astronomy ⇒

astron = [Greek] star, nomos = [Greek] knowledge

Astronomy is the science that studies everything outside of the Earth. This includes, among other things, the Moon, planets, Sun, stars, black holes, Milky Way, and Universe. People who do astronomy are called astronomers.