List of galaxy groups and clusters

The major nearby groups and clusters are generally named after the constellation they lie in.

This represents an ad hoc systematic naming system.

The Local Group contains the largest number of visible galaxies with the naked eye.

However, its galaxies are not visually grouped together in the sky, except for the two Magellanic Clouds.

Through the researching of member positions, distances, peculiar velocities, and binding mass, former clusters are sometimes found to be the product of a chance line-of-sight superposition.