A field galaxy is a galaxy that does not belong to a larger cluster of galaxies and hence is gravitationally alone.
Most galaxies, roughly 80%, within 5Mpc of us exist in groups or clusters of galaxies.
Most low-surface-brightness galaxies are field galaxies.
- ^ Astronomische Nachrichten, "On the Emptiness of Voids", Schmidt, K.-H.; Bohm, P.; Elsasser, H.; vol. 318, no. 2, p. 81, Bibcode: 1997AN....318...81S
- ^ "An Introduction to Galaxies and Cosmology", David J. Adams and others