Here's why:

* No particular shape: Irregular galaxies lack the defined spiral arms or elliptical forms of other galaxy types. They often appear chaotic and asymmetrical.

* Rich in gas and dust: These galaxies are known for their abundance of gas and dust clouds, which are the raw materials for star formation. This can make them appear quite bright and colorful.

Examples of irregular galaxies include:

* The Large and Small Magellanic Clouds: These are dwarf galaxies that are satellite galaxies of the Milky Way.

* The Antennae Galaxies: These two galaxies are currently merging, resulting in a spectacular, chaotic appearance.

Let me know if you'd like to learn more about irregular galaxies!