Classify each of the following as either a planet, a star, or a galaxy: Mercury, Venus, Polaris, Earth, Sun, Mars, Jupiter, Milky Way, Andromeda, Saturn, Virgo A, Maffei 1, Uranus, Neptune, Sirius, Vega.
Stars: Sun, Polaris, Sirius, Vega
 
 Planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
 
 Galaxies: Milky Way, Andromeda, Virgo A, Maffei 1