Tidal loops, where a tail joins with its parent galaxy at both ends, are rarer still.

Globular cluster, a spherical collection of stars whose orbit is either partially or completely in the halo of the parent galaxy.

There are two, asymmetrical radio-emitting lobes straddling the parent galaxy.

Then one of the stars had suffered a supernova explosion, briefly and gloriously outshining its parent galaxy.

This galaxy orbits the more famous Andromeda Galaxy, and was previously undiscovered due to its position in front of the bright disk of the parent galaxy.

At a distance of 630,000 light years, it is still visible in moderate sized telescopes but the parent galaxy is nearly invisible.

Out here on the Rim the stellar density was low, and most of the available light came from the long, faintly shining fog bank, which was the parent galaxy.

Streams of galactic material are pulled out away from the parent galaxies and the halos of dark matter that surround them.

Superkick: Black hole expelled from its parent galaxy (MPE)

It probably got slung out of its parent galaxy early on.