A spiral galaxy: the Milky Way
The Milky Way, this swarm of stars running across the entire sky, is the spiral galaxy within which lies our Sun and its procession of planets, among them the Earth.
It is composed of a thin disk containing spiral arms, and it hosts in its center a bulge through which goes a bar. The density of stars is very high in the bulge.
Because we are inside the Milky Way, it is not possible to take a photograph of it. Astronomers draw outlines of it using their various observations.