Simple Definition of astronomy

from our Learner's Dictionary

astronomy

noun

əˈstrɑːnəmi How to pronounce astronomy (audio)
: the scientific study of stars, planets, and other objects in outer space

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“Astronomy.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/astronomy. Accessed 14 Apr. 2026.

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