region, part - the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"

Milky Way, Milky Way Galaxy, Milky Way System - the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky

solar system - the sun with the celestial bodies that revolve around it in its gravitational field