astronomer

noun

as·​tron·​o·​mer ə-ˈsträ-nə-mər 

: a person who is skilled in astronomy or who makes observations of celestial phenomena

Examples of astronomer in a Sentence

Recent Examples on the Web

This means that astronomers will have to wait until the 2040s, when NASA's Habitable Worlds Observatory will hopefully launch, to answer the question of whether GJ 3378b really does have an atmosphere or not. — Keith Cooper, Space.com, 2 July 2026

Every summer, the park hosts a three-day astronomy festival that brings space scientists, amateur astronomers, and youth groups together to learn about the night sky. — Scott Bay, Travel + Leisure, 2 July 2026

Even so, astronomers don’t know if there would have been enough gas around to produce the biggest black holes. — Quanta Magazine, 2 July 2026

By combining their temperature measurements with the planet’s mass and models of how giant planets cool over time, the astronomers effectively rewound its thermal history. — Sam MacDonald, Scientific American, 1 July 2026

Word History

Etymology

Middle English, "one versed in astronomy or astrology," from astronomie astronomy + -er -er entry 2

Note: Alternatively, Oxford English Dictionary, third edition, and Middle English Dictionary see the English word as derived from Medieval and Late Latin astronomus "astronomer" (borrowed from Greek astronómos) plus the agent suffix -er.

First Known Use

14th century, in the meaning defined above

Rhymes for astronomer

• ionomer
• monomer