This lesson will describe how scientists classify galaxies.

What is a galaxy? What is the name of our galaxy? Site offers answers to these questions as well as many more.

Find out about the behavior and characteristics of the many satellite galaxies that orbit other galaxies.

Explains what galaxies are and their different shapes. Includes details on the Milky Way.

Journey to the wildest regions of space, and wrestle with cosmic giants, galaxies. Explore the Hubble Deep Fields from a statistical point of view.

Find out how galaxies are classified and then see if you can apply that knowledge to identify the different types of galaxies. In addition to explaining Hubble's galaxy classification system, the site has links to Hubble Space Telescope...

Amazing Space promotes the "science and majestic beauty of the universe for use in the classroom." Here you can find learning activities, lesson plans, teaching guides, and helpful tips for students eager to learn about space and space...

Provides a general overview of spiral galaxies, including descriptions of the different classes of spiral galaxy.

Breathtaking images from the Hubble Space Telescope give a new perspective to our world.

A NASA scientist, Dr. Sten Odenwald, answers many students' questions. Topics include planets, galaxies, black holes, the origin of the universe, and common misconceptions about space.

Explore the universe and celestial phenomena made visible by Hubble. High-quality photos of planets, stars, nebulae, and galaxies, complete with individual descriptions, can be viewed online and downloaded for printing and personal use.

This site from the Cambridge Relativity provides a brief description of the structure of the Milky Way galaxy. The parts described are the disc, bulge, and halo.

An image of a quasar. The large redshifts imply that quasars lie near the edge of the observable universe and must emit tremendous amounts of energy. There are also many embedded links to related topics.

A virtual journey through space offers photos and facts about Earth and its neighboring planets, comets, other celestial bodies of the Solar System, and the Milky Way and Andromeda galaxies.

Black holes seem to be a constant point of debate for astronomers. This article confirms the theory that black holes can help form massive stars and gives more support to the idea that black holes play a big role in galaxy formation....

Black holes seem to be a constant point of debate for astronomers. This article confirms the theory that black holes can help form massive stars and gives more support to the idea that black holes play a big role in galaxy formation....

In this instructional activity, learners will learn about Galileo Galilei and space.

Zoom in on everything from distant galaxies to the Earth's most interesting places! See the Pyramids, London, Hoover Dam, and more. Check for bald spots on the heads of the presidents at Mt. Rushmore. See how much the polar ice caps on...

The Dissection of a Galaxy image offered here examines how a galaxy functions by taking it apart through an image. In addition, a detailed textual overview explains various specifics of the picture.

This image, titled "Morphology of Our Galaxy's 'Twin'" features three individual pictures of a nearby spiral galaxy that closely resembles our own. The text under the image details various specifics about the picture.

This image, titled "Big Galaxy in Baby Universe" features an infrared picture in four parts of a distant galaxy. The text under the image details various specifics about the picture.

Under the heading, "Galaxies Gather at Great Distances" this site examines (and discusses) an image featuring a group and cluster of galaxies. The text goes on to describe details specific to the image.

The brief text that accompanies the image at this site (titled Finding Faint Galaxies) describes details of the picture which features faint images of galaxies enhanced by infrared.

The Great Observatories Present Rainbow of a Galaxy image is part of a series of photographs taken from the Spitzer Space Telescope. The picture is accompanied by a brief textual overview outlining specific details in the picture.