Users can choose from an extensive selection of links to resources for use in the study of the history of space exploration. The links provide access to historic information and publications, chronologies, and mission summaries for American, Russian, European, and other space missions. For educators, there are links to guides to robotic spacecraft and to observing the space shuttle in orbit. Links ... Full description.

This animation depicts the formation of the solar system from a solar nebula, a great swirling cloud of gas and dust. It is accompanied by a link to a written description explaining the solar system's formation in greater detail. Full description.

This educational brief provides an overview of solar activity, including a description of Earth's magnetosphere and of various solar phenomena such as the solar wind, Coronal Mass Ejections (CMEs), sunspots, solar flares, and others. A list of links to additional material is also provided. Full description.

This educational brief provides a summary of the historical development of our understanding of magnetism and magnetic fields, including a listing of many of the contributions of individual scientists. Links to additional information are embedded in the text. Full description.

This resource offers four videos that explain Kepler's three laws of planetary motion. A brief introduction provides biographical information on Kepler. Links to a glossary are embedded in the text, and written descriptions of what is occurring in the videos are provided. Full description.

This tool was designed by NASA engineers to demonstrate and teach principles of microgravity and its relationship to science and math. Teachers may perform a series of demonstrations to provide a visual, physical connection between free-fall and microgravity conditions and to understand why certain experiments are performed under microgravity conditions. Full description.

This site discusses the cosmic microwave background, radiation left over from the Big Bang. Particular emphasis is upon tiny fluctuations in the temperature of the radiation, which are believed to reflect fluctuations in the density of matter in the early universe. Full description.

This collection of images, movies, and animations from NASA's Solar and Heliospheric Observatory (SOHO) features a large selection of images of the sun and of solar phenomena. Although most of the imagery is of the sun, a few images of comets and planets as they transit the solar disk are available. Full description.

As part of this activity, students assemble a paper model of the sun and answer questions about solar radiation, surface features of the sun, and solar activity cycles. A template for printing and instructions for assembling the model are provided. Full description.

This document provides a brief introduction to supernova explosions. Topics include types of supernovae, causes of the explosions, and what happens to the material in a star after the explosion. Links to a glossary are embedded in the text. Full description.