Stephen Hawking, Carl Sagan and Arthur C. Clarke share their thoughts on a number of topics including the Big Bang Theory, the expansion of the universe, black holes, extraterrestrial life and the origins of creativity.

Bill Nye explains the orbit and phases of the Earth's moon.

Journey through space and time, witnessing the birth of the sun and traveling to the outer limits of the solar system.

Follows Dr. Hazel Barton and Nancy Aulenbach as they travel through the caves of Arizona, ice caves of Greenland and underwater caves in the Yucatan, not only for sport and thrill, but also to search for discoveries that may lead to cures for human diseases.

This film and the accompanying teacher's guide are designed to teach children basic principles of physics. In a fictitious story set on Mammoth Island, some of the inhabitants learn about the properties of light when they are in a room full of crystal trophies.

Explores some of the most amazing features of our very own solar system, how the forces of nature carved out beauty and order from the chaos of space, how our home planet doesn't sit in magnificent isolation but is intimately connected with the rest of the solar system, and how these connections have created the haven we call Earth.