The irregular galaxy is one of the three types of galaxies. There are spiral, elliptical and irregular galaxies in the universe. Irregular galaxies do not have a set shape. They are created when two galaxies affect each other when they are close to one another.
Photo: The ring galaxy is an irregular galaxy (source: NASA).
Irregular galaxies have many different shapes. Their unusual shapes are often the result of two galaxies interacting with one another. The gravitational pull of the two galaxies distort one another.
Age and Color
There is no set pattern with the age of this galaxy. Some irregular galaxies are young. Others are much older.
Because their ages vary, irregular galaxies do not have a set color. In contrast, young spiral galaxies are usually blue. And, older elliptical galaxies are usually red.
One type of irregular galaxy is the ring galaxy. Ring galaxies are formed when a small galaxy passes through a large galaxy. The gravitational interaction distorts the shape of the two galaxies.
Improving Your Reading and Thinking Skills
Think for a few moments. Try to recall the major ideas in this article. When you are done, click the box below for a list of main ideas.
How did you do? With practice, you should be able to identify many of the major ideas. You may even discover some important ideas that aren’t listed.