Provides an introduction to galaxies, answering questions about what they are, where they come from, the Milky Way, the galactic halo, galaxy collisions, and related topics.
Discusses how stars cluster into galaxies and how galaxies move apart as the universe expands. Describes the properties of stars and the life cycle of a star. Identifies our place in the Milky Way galaxy and explores the vast universe of galaxies beyond the Milky Way. Describes how increasingly powerful tools allow scientists to look ever deeper into the universe.