Visitors to this site can follow the life cycle of a star, beginning with its formation from matter exploded outward by the Big Bang, followed by its expansion into a red giant as nuclear "fuel" is consumed, and ending with its "death" in a supernova, after which it becomes a neutron star or black hole. Full description.

Visitors can read and view animations and a movie that describe the SeaStar spacecraft and the SeaWiFS instrument. Materials presented here explain the physical characteristics of the vehicle, its launch procedure and orbit, and the capabilities of the instrument. Links to related topics are provided. Full description.

This article provides an account of the total eclipse of the Sun which occurred on August 12, 1999, from the viewpoint of researchers and spectators who witnessed the event in Rimnicu-Vilcea, Romania. Users can view a movie and listen to an audio narrative provided by one of the researchers as she photographed the eclipse. Links to related topics are provided. 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 site provides a description and graphic representation of the Coriolis Force, with links to a video and related sites. Full description.

This computer-generated animation depicts the Clouds and the Earth's Radiant Energy System (CERES) instrument in operation. CERES measures the energy at the top of the atmosphere and estimates energy levels in the atmosphere and at the Earth's surface. Using information from very high resolution cloud-imaging instruments on the same spacecraft, CERES also will determine cloud properties, including ... Full description.

This site consists of a gallery of artists' conceptions of catastrophic strikes on Earth by asteroids or comets, including the impact which occurred at the Cretaceous-Tertiary boundary and is suspected of causing mass extinction of the dinosaurs. Links to other related sites and a short movie of the Peekskill, New York meteorite, which fell in 1993, are also included. Full description.

This collection of visualizations produced by the NASA Laboratory for Atmospheres includes still images, movies, and 3D/VR images. Viewers can select images of hurricanes and other weather phenomena, the Earth from space, fires, ash clouds, and a space shuttle launch. Links to other sources of imagery are also provided. Full description.

This site presents a brief account of the Near Earth Asteroid Rendezvous (NEAR) flyby of the asteroid 253 Mathilde. Materials include descriptions of the NEAR mission, pre-encounter optical navigation, science objectives, images, and animations. Links to related topics are included. Full description.

At this site, users can read and view pictures and videos that explain the mechanisms that trigger tsunamis, how they travel across great distances of the ocean, and what damage they cause. Full description.