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Andromeda an autumn constellation in the northern sky, located between Perseus and Pegasus, with which it shares the bright triple star Alpheratz, and containing a spiral galaxy. [1/2 definitions]
extragalactic outside or beyond the galaxy of the Milky Way.
galactic of or pertaining to a galaxy, esp. the Milky Way. [1/2 definitions]
galaxy a collection of billions of stars and other matter held together by gravity. Our planet Earth and the sun belong to the Milky Way galaxy. They are only tiny parts of this galaxy.
Milky Way the galaxy that contains the earth, the sun, and the solar system. It can be seen in the night sky as a long, cloudy group of stars.
radio galaxy a galaxy that emits a large amount of radio energy.