This movie shows a total eclipse of the Sun which occurred in 1994. It is accompanied by a link to a written description of the Sun's physical characteristics.

This tutorial explains some of the techniques developed by astronomers to determine the distances of objects we see in the sky. Links to additional information are embedded in the text.

This site presents graphic plots of solar wind and magnetic field data from the Advanced Composition Explorer (ACE) spacecraft.

This site presents information about the Advanced Composition Explorer (ACE) spacecraft and its mission, science goals, history, and background. The mission summary includes a brief description of the energetic particles from the sun and from interstellar and galactic sources that are the objectives of the ACE mission. Links to additional information are also supplied.

This lithograph provides a full-disk view of Earth photographed by Apollo 17 astronauts, Dec. 7, 1972. The accompanying text describes the view seen in the photograph and the circumstances in which it was taken. Suggestions for activities in which the photograph can be used are also provided.

These views of asteroids were imaged at close range by the Galileo and Near Earth Asteroid Rendezvous (NEAR) spacecraft. They are presented at the same scale, and images of Mars' moons, Phobos and Deimos, and Ida's moon Dactyl are also shown. The accompanying text provides a description of the images, some historical facts and statistical data, along with significant dates in asteroid exploration.

This training module was designed to help the user identify and grasp basic concepts associated with space travel and deep space missions. Separate sections deal with topics such as the physical environment of space (solar system, gravity, orbital mechanics), flight projects (mission concepts, system requirements, design, onboard systems and instruments), and flight operations (launch, cruise, encounter). Links to related topics are embedded in the text.

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.

This resource offers access to a variety of materials, including general information about COOL, a photo gallery, press releases, talks and papers, and research projects. There are links to archived and real-time ocean data (sea surface temperature, surface currents and waves, autonomous glider data), and an "underwater weather forecast".

You can use this calculator to create your own metaphor for geologic time. The history of the could be the the distance from your home to school - you can figure out where dinosaurs would be on the trip. Or the history of time could be the length of a class - and you could figure how much of the class you have to sit through before intelligence appears.

At this site, users can access and compare data from a large selection of spacecraft, instruments, and ground-based facilities. Most data is related to studies of solar wind, other particle emissions, and Earth's magnetic field.

This online collaborative project is part of the Center for Improved Engineering and Science Education (CIESE) program, which has developed internet activities for the elementary, middle, and high school level student. Based on data collected by their household members and their classmates, students determine the average amount of water used by one person in a day. They compare this to the average amount of water used per person per day in other parts of the world. The project provides instructions, information, reference materials, online help, and a teacher area for help and ideas.

This lithograph depicts a view of Earth taken from Apollo 10 during its journey to the Moon in May 1969. False-color satellite images showing chlorophyll concentration, sea surface temperature, topography, and ozone concentration are also featured. The images are accompanied by a brief description, some statistical facts, and a list of important dates in the history of Earth exploration.

EarthComm (Earth System Science in the Community) is an Earth science curriculum designed for use by all students in U.S. high schools. This website contains resources for teachers, students, and parents, as well as information on the goals and learning approaches EarthComm uses. In addition to the general resources offered, state-based resources are also available.

This movie shows Venus and Earth as they rotate. The images are superimposed on each other so that differences in rotation speed and tilt of axes can be seen. Links to documents describing the physical properties and characteristics of the two planets are provided.

Materials presented here describe how new data from surveys, satellite imagery, and buoys have led to a revised view of the nature of the coastal upwelling that occurs seasonally off the coast of California. Includes references and links to related sites.

This webpage is part of NASA's Classroom of the Future program. It provides background information about how ocean temperatures, currents, and atmospheric conditions combine to produce an El Nino event. The site features text, scientific illustrations, a glossary, and links to other Classroom of the Future pages.

This site, part of NASA's Classroom of the Future program, describes how oceanic temperatures, currents, and atmospheric pressure patterns vary and, under certain conditions, produce an ENSO (El Nino Southern Oscillation) event. It features text, scientific illustrations, a glossary, teacher pages, and a list of references.

Users can select a variety of materials on El Nino/La Nina. Materials presented here include bibliographies, news articles, technical and research information, movies, animations, and cartoons.

This tutorial introduces students to the concepts of electromagnetic waves, wavelength, and the electromagnetic spectrum. Diagrams and written descriptions explain how wavelength is measured and explore the traditional divisions of the spectrum: radio, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

This museum exhibit allows visitors to examine how medical imagery has changed the way we look at our bodies. Exhibits include modern medical imaging, art and artifacts, and historic medical illustrations and models.

Visitors can explore the scientific principles behind popular sports such as baseball, skateboarding, surfing, and bicycling.

This teacher's guide provides background information about the moon, its geological history, and progress in lunar science from before, during, and after the Apollo program. A set of activities is provided to demonstrate such concepts as scale models, proportional relationships, rock and mineral identification, and lunar geography.

Users can learn about the GEOTAIL spacecraft and its mission to study the Earth's magnetotail. Materials presented include an overview of the project, a diagram of the spacecraft, and a description of the instrument packages carried aboard the satellite.

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.

Users can see the most current GOES infrared image of the Northern Hemisphere, which shows water vapor circulation patterns over the U.S. and Canada.

This database contains imagery from geosationary satellites. Visitors can access daily images or archived imagery form GOES-9, METEOSAT, and other satellites. The imagery features hemispheric and whole-disk views of Earth, water vapor maps, and images of storms and other special events. Links to satellite homepages and to other related topics are included.

This graphic illustration and accompanying text description show the distribution and relative proportions of water in the form of solid, liquid, and gas in Earth's lakes, rivers, oceans, polar ice, atmosphere, soil, and groundwater.

The home page of the Astrophysics Science Division at Goddard Space Flight Center provides information on the division's research projects, missions, goals, and activities. Topics include the evolution of galaxies, stars, and planets; the diversity of worlds outside our solar system; the possibillity of life on those worlds; and astrophysics questions such as what powered the Big Bang, what is dark energy, and what happens at the edge of a black hole. Links are also provided to mission webpages, news articles and notifications of seminars and meetings.

The homepage of the Visitor Center at Goddard Space Flight Center provides access to a variety of information about the history, missions, and upcoming events at the center. Users can find information on public exhibits, educational resources, and programs on space and Earth science and technology.

In this activity, students construct data tables and graphs of ozone concentrations for selected locations using TOMS data for the years 1979 through 1992. Instructions and TOMS images are provided.

After Antarctica, Greenland's ice cap contains the second largest mass of frozen fresh water in the world. Based on new research using NASA's airborne laser altimeter, scientists have identified pronounced thinning of Greenland's ice cap. This new research indicates enough ice loss to cause a measurable rise in sea levels. This site, produced by NASA's Scientific Visualization Studio, features text, photographs, satellite imagery, and animations to describe the loss of ice and the use of lidar (laser altimetry) to make the precise measurements necessary to reveal the loss of ice.

This is an introduction to the concept of seafloor spreading proposed by Harry Hess in the early 1960's. This site offers multiple links to further examine this geologic hypothesis.

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 are also provided to a variety of spacecraft homepages and to other topics such as a primer on the basics of space flight, the Apollo lunar surface journals, and the NASA historic archives.

Astronomers estimate the age of the universe in two ways: by looking for the oldest stars, and by measuring the rate of expansion of the universe and extrapolating back to the Big Bang. This site explains how these measurements are made and points out the discrepancy in ages derived from the two methods. It features images, background information, and links to other resources regarding the age of the universe.

Students can use this map to track the progress of hurricanes and tropical storms in the western Atlantic Ocean and Carribean Sea. It includes descriptions of hurricane watch and warning conditions.

This site provides general information on hurricanes, including how they form, where and when conditions favorable to hurricane formation exist, how wind speeds are classified, and what conditions cause hurricanes to diminish and decay. It features text, scientific illusrations, and links to related topics in other parts of the Earth Observatory website.

Visitors can learn about the IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) spacecraft, instruments, and mission. Materials include news articles, photos, animations, documentation, and datasets. For educators, there is the IMAGE Public Outreach, Education, Teaching and Reaching Youth (POETRY) site, which provides teachers, students and the interested public with the latest information about auroral science and the study of Earth's magnetic field. POETRY resources include weekly space science problems, classroom activities, math worksheets, a tutorial on Earth's magnetic field, and others.

This site discusses the mission of ICESat, the benchmark Earth Observing System satellite intended to measure ice sheet mass balance, cloud and aerosol heights, topography, and vegetative cover. Questions of particular interest to the mission include: is sea level is rising?; are the Greenland and Antarctic ice sheets growing or shrinking?; are ice sheets are capable of causing large, rapid changes in sea level?; and will the ice sheets melt or grow in a warmer climate? Datasets, imagery, and pictures of the launch are included.

This collection of images features spacecraft and instruments used for high-energy research, typically studies of X-rays and Gamma rays. The collection includes pictures of early astronomy rockets and instruments, an archive of videos, and a large selection of images of vehicles and instruments from more recent missions. Some of the more recent missions also include lightcurve, spectral, and/or image data.