What is a black hole? Learn about frame dragging, space-time, cosmic strings, and what they mean to time-travelers. This is a very interesting clip that uses CG graphics, scientific discussion, and comprehensive narration to postulate...

Stars are amazing to see in the night sky. Learn how each star has different colors and that some are hotter and some are colder. A young girl and an astronomer discuss starlight, nebulae, galaxies, and life on other planets. This is a...

Part three concludes "A Practical Guide to the Universe," completing the description of the Big Bang Theory and what it means. This episode touches on light travel, light speed, and what that means in relation to what we see. While this...