天文学(てんもんがく)

てんもんがく
noun
astronomy
1. astronomy
The scientific study of celestial objects, space, and the physical universe as a whole.
I'm interested in astronomy, so I bought a telescope.
古代(こだい)から天文学(てんもんがく)は発達(はったつ)してきた。
Astronomy has developed since ancient times.
I read about the latest discoveries in astronomy.

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Note: The character 天(てん) means 'sky/heaven' and 文(もん) here refers to patterns or phenomena, so 天文(てんもん) literally means 'celestial patterns.'