The Two Micron All Sky Survey at IPAC website provides an image gallery of the solar system's objects, Jupiter's moons, H II regions, star formation regions, and reflection nebulae, open star clusters, globular star...

This NASA Image of the Day is the first image of the Earth and moon in a single photograph. The image was captured 7.25 million miles from Earth by Voyager 1 in 1977. More information about the photograph and a link to...

This case study uses the example of Pluto: how do we determine what a planet is? The lesson compares orbital parameters like semi-major axis, orbital period and orbital resonance of different planets. The material would...

This exhibit from Exploratorium Exhibit Services simulates the formation of desert landscapes. The site provides a link to a QuickTime video of the exhibit.

Students measure sunspot speeds and shapes across the solar disk to determine whether the spots are on the Sun or are planets revolving around it (Galileo's dilemma). Includes links to hands-on demonstration of concepts.