Elliptical galaxies

Definition

Elliptical galaxies are a type of galaxy characterized by their elliptical shape and smooth, featureless appearance. They lack the distinct arms seen in spiral galaxies and typically contain older, red stars.

5 Must Know Facts For Your Next Test

1. Elliptical galaxies range from nearly spherical to highly elongated shapes.
2. They generally have very little interstellar gas and dust compared to spiral galaxies.
3. Star formation is minimal or non-existent in elliptical galaxies due to the lack of gas.
4. They are often found in galaxy clusters and can be among the largest known galaxies.
5. Elliptical galaxies are classified on a scale from E0 (spherical) to E7 (highly elongated).

Review Questions

• What distinguishes elliptical galaxies from spiral galaxies?
• Why do elliptical galaxies have minimal star formation?
• How are elliptical galaxies classified based on their shape?

Related terms

Spiral Galaxies:

Galaxies characterized by rotating arms that extend outward from a central bulge.

Lenticular Galaxies:

Intermediate-type galaxies with a central bulge and disk but without significant spiral structure.

Galaxy Clusters:

Large groupings of hundreds or thousands of galaxies bound together by gravity.