This lithograph shows images of Saturn, its rings, and four of its moons. The images were captured by the Voyager 1 and 2 spacecraft. They are accompanied by a brief description and history, some statistical facts, and important dates in the exploration of Saturn. Full description.

Visitors can access information on space weather and the aurora, a variety of papers on related topics such as navigation, the upper atmosphere, and radiation hazards, and classroom materials for teachers. Teaching materials include posters, movies, activities, and a curriculum for grades 7-12 on space physics and terrestrial effects. Links to other related topics are also provided. Full description.

Selected science questions are posted here and answered at the end of the week. Previous questions of the week and their answers are also listed in reverse chronological order. Full description.

Visitors to this site will learn about NASA's manned and unmanned explorations of the Moon and Mars. Topics include the history of the Apollo program, robotic missions to Mars, and future visions for space exploration. The document "Vision for Space Eploration," which describes a timeline and major realignment of NASA's resources and efforts for manned and unmanned missions to the Moon and elsewhere, ... Full description.

The Jet Propulsion Laboratory's (JPL) homepage provides links to spacecraft and mission information, imagery, news articles, events, features, and public services. Users can access articles and imagery from the Mars Rover and Cassini missions, images from the Spitzer Space Telescope, and an El Nino/La Nina Watch. Full description.

Users can access news articles, background information and links about the International Space Station. Materials presented here include crew biographies, expedition press kits, accounts of science experiments, and imagery taken from the station. Other features include a clock/counter that logs the station's and the crew's time in orbit and information for ground-based observers who wish to view the ... Full description.

This processed color image of Jupiter was produced in 1990 by the U.S. Geological Survey from a Voyager image captured in 1979. An artist's conception of Jupiter's magnetic field as it is stretched out by the solar wind is also featured. The images are accompanied by a brief description and history, some statistical facts, and a list of significant dates in the exploration of Jupiter. Full description.

Users can read about how distances are measured in the solar system. Attempts by early astronomers to estimate distances and ongoing work to establish and refine the astronomical unit (the mean distance from the Earth to the Sun) are described. This is part of NASA's online book entitled "From Stargazers to Starships" and links to other parts of the site and to related topics are provided. Full description.

This tutorial explains how satellite images are taken, transmitted to Earth, and converted into viewable form. Descriptions of each phase of the process are included: capture and transmittal of the image by a satellite or spacecraft, receiving the signal at one of the Deep Space Network's antennas, and processing the data into an image at the Jet Propulsion Laboratory's Multimission Image Processing ... Full description.

Teachers can access activities and lesson plans, introductory material, a glossary, and frequently asked questions about the sun. Materials include images, videos, CDs, and posters. An extensive selection of links to other sun-related materials is also provided. Full description.