This resource covers the size and scale of Solar System objects, such as the masses, densities, and relative radii of the sun and planets; revolution and rotation of the planets; conservation of angular momentum;...

The Annenberg Media organization has created this wonderful new resource for physics teachers, students, and anyone else who would care to learn more about dark matter, string theory, and other "big topics in modern...

"Powers of Ten", the film made by Charles and Ray Eames in 1977, takes the viewer from the core of an atom to the edge of the universe, moving 10 times further every 10 seconds. The film is about scale and how we view...

The Search for ExtraTerrestrial Intelligence (SETI) Institute has as its mission to explore, understand and explain the origin, nature, prevalence and distribution of life in the universe. The Web site contains the...

This website, containing information from the Sloan Digital Sky Survey, provides projects and activities for advanced astronomy students. In this particular one, the user retraces Edwin Hubble's steps to discover that...