Disc galaxy

The Sculptor Galaxy (NGC 253) is a disk galaxy

A disc galaxy is a galaxy characterized by a disc, a flattened circular volume of stars. These galaxies may or may not include a central non-disc-like region (a galactic bulge).

Disc galaxy types include:

• spiral galaxies
  • unbarred spiral galaxies (types S, SA)
  • barred spiral galaxies (type SB)
  • intermediate spiral galaxies (type SAB)
• lenticular galaxies (types E8, S0, SA0, SB0, SAB0)

Galaxies that are not disc types include:

• elliptical galaxies (type dE)
• irregular galaxies (type dI)