Constellation
Part of speech: noun
Definition: An arbitrary formation of stars perceived as a figure or pattern. An image associated with a group of stars. Any of the 88 officially recognized regions of the sky, including all stars and celestial bodies in the region. The configuration of planets at a given time (notably of birth), as used for determining a horoscope. A wide, seemingly unlimited assortment.
Galaxy
Part of speech: noun
Definition: a collection of billions of stars, galactic dust, black holes, etc. of which there are billions in the known universe. They usually form spiral or elliptical shapes likely due to a central gravity well (i.e. supermassive black hole), but some form irregular shapes (especially if they are broken away from another galaxy).our Milky Way galaxy