NASA
Nasa Star Child: The Universe (Level 1)
This site provides an introduction to the origin of the universe for the young child and the Big Bang theory. There is also a song about the Doppler Shift. Vocabulary glossary and printable version available.
NASA
Nasa Star Child: The Universe (Level 2)
This site provides a description of the universe and what it contains. Includes links to definitions, activities, and an audio song. Printable version available.
BBC
Bbc: Origin of the Universe
Try this introduction to ideas about how the universe began and how it might end. Topics include; the big bang and its echoes, antimatter, and inflation/expansion of the universe.