Definition, Meaning & Synonyms
galaxy
noun
/ˈɡæləksi/
Definition
A large system of stars, gas, dust, and dark matter bound together by gravity, typically containing millions to trillions of stars.
Examples
- The Milky Way is the galaxy that contains our Solar System.
- Galaxies can be spiral, elliptical, or irregular in shape.
- Scientists estimate there are over two trillion galaxies in the observable universe.
Meaning
In astronomy, a galaxy is a massive collection of stars and other celestial bodies that are held together by gravity.
Synonyms
- star system
- stellar system
- cosmic system
