This animation shows a sequence of daily images of the southern hemisphere in which daily and seasonal fluctuations in the ozone hole over Antarctica can bee seen. The images were captured by the Total Ozone Mapping Spectrometer (TOMS), an instrument carried aboard the Earth Probe spacecraft. 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.

Users can access a variety of information about the The SOHO Extreme Ultraviolet Imaging Telescope, as well as maps, imagery, and data. A description of the instrument is provided, along with temperature maps, movies and images of eclipses, solar storms, and coronal mass ejections. Links to related sites are also included. Full description.

Users can access a variety of information on the SOHO satellite and instrument. The scientific purpose of the mission, a study of the extended solar corona, is discussed, and links to mission logs, news articles, observations, and meetings are provided. Links to a tutorial, data, and software are also included. Full description.

Users can access a selection of technical information and data about earthquakes in the U.S. and around the world. A current worldwide list of earthquakes is available, as are data on geophysical solutions, a catalog search, an automatic data request function, mining seismicity information, and a registry of seismograph stations. Full description.

Visitors can check this U.S. map to see the locations of current weather watches, warnings, and advisories. Full description.

Users can access the most current GOES image of the hurricane sector, which includes the Caribbean and the Southwestern Atlantic Ocean. The image is in the infrared band, which is useful for remote sensing of water vapor. Full description.

This database of imagery houses a large collection of satellite images capturing some of the more important weather and environmental events of the last 30 years. Users can access images of many types of storms, fires and smoke, floods, weather fronts, ocean and sea surface phenomena, and snow cover. Full description.

This simulator allows the user to manipulate seasons on Earth or the other planets. The target planet, viewpoint, date and time, field of view, and other options may be chosen. Full description.

Materials presented here outline some basic concepts associated with space flight. Users can read about orbits and the difference between an orbit and a trajectory, escape velocities for Earth and some planets, launch velocities and transit times for interplanetary flights, and the effects of time dilation for astronauts travelling at near-light speeds. This is part of the famous Rand corporation ... Full description.