The following is a list of notable galaxies..

Irregular galaxies—such as the Large and Small Magellanic Clouds that flank our Milky Way—appear misshapen and lack a distinct form, often because they are within the gravitational influence of other galaxies … Galaxies that are not spiral, lenticular, or elliptical are called irregular galaxies. The next step in the great cosmic puzzle is to find and characterize as … There are about 51 galaxies in the Local Group … If there are that many galaxies in this Universe, how many stars are there likely to be? For the first time, we can scientifically estimate how many galaxies are out there in the Universe.

This makes the probability of an Earth similar to our own or even many Earth like planets extremely likely.