(noun)
Pronunciation: gæləksi / ɡæl.ək.si
Plural: galaxies
A galaxy is an extremely large group of stars and planets that extends over many billions of light years.
Example usage: Astronomers have discovered a distant galaxy.
Synonyms: star system, solar system, nebula
The Galaxy is the extremely large group of stars and planets to which the Earth and the Solar System belong.
Example usage: The Galaxy consists of over 100 billion stars.