Do galaxies collide? Apply concepts of scale to grasp the distances between stars and galaxies.

This site provides an introduction to galaxies for the younger student, that is divided into 2 levels of understanding. Find out what type of galaxy looks like a giant pinwheel. Audio content included. Good glossary, and a printable...

This resource explores the different types of galaxies through text and images.

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

Learn why quasars are the brightest things in the universe. Vocabulary words linked to a glossary of terms and a printable version are available.

This site provides a description of the universe and what it contains. Includes links to definitions, activities, and an audio song. Printable version available.

Understand that smaller parts make up the larger parts of our solar system. See that gas and dust come together to form a star, small rocks and asteroids come together to form planets, and so on. This page is a reference page that...

Start with the questions all learners ask: How big is the universe, how far away are the planets and stars, how did they form and when, how do they move and why? Build on their natural curiosity. The Smithsonian, in cooperation with...

Brief description of light-years with examples and images.