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Singular = astronaut, singular possessive = astronaut's. Plural = astronauts, plural possessive = astronauts'.
The possessive form of the singular noun astronaut is astronaut's.Example: The astronaut's photo was on the front page of the newspaper.
An astronaut.
The article "a" is used before consonant sounds, while "an" is used before vowel sounds. In this case, the word "astronaut" starts with a vowel sound ("a"), so "an astronaut" is the correct usage.
An astronaut is a commander, pilot, or a crew member of a spacecraft. In Russia an astronaut is known as a cosmonaut.