Definitions from the Web
Antonym for cosmonaut:
Astronomer
Sense 1: Astronomer (Noun)
Definition: A person who studies celestial objects, such as stars, planets, galaxies, and the universe as a whole.
Sample sentence: The astronomer spent many nights observing the constellations and mapping the movements of the planets.
Sense 2: Astronomer (Noun)
Definition: Someone who is highly knowledgeable about astronomy and its principles.
Sample sentence: She is regarded as the greatest astronomer of our time, having discovered numerous celestial phenomena.
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