galaxies

Explains what galaxies are, how they were formed, and the types of galaxies.

Discusses discoveries and theories concerning planets, stars, and galaxies.

Identifies the nature, locations, movements, and different categories of galaxies, examining the Milky Way and other known examples.

Examines what is known about various galaxies and presents theories about their formation.

Describes the Milky Way and other galaxies and discusses such topics as why the sky is dark at night, the "Big Bang" theory, the future of the universe, and the search for intelligent life. Includes an activity on the most distant visible objects in the sky.

Provides an insider's view of our own Milky Way and discusses the nature and behavior of galaxies in general.

Describes our Milky Way and considers the scientific probability that our universe contains about 100 additional galaxies each with an average of 100 billion stars.

Describes the characteristics and movement of stars, the constellations they form, composition and shapes of different galaxies, and more.

Studies the clouds of interstellar space, considering the process by which new stars are formed, looking at how star birth generates planets and perhaps life, and studying how the deaths of stars begins the process anew.

A look at nebulae, discussing how they are measured, reflection nebulae, supernovas, and more.