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. Full description.

This biography of Admiral Harry Hess details his career in the United States Navy, during which he collected data on the seafloor, and as a geologist, in which he incorporated his observations on seafloor features into a hypothesis that the seafloor was spreading. Full description.

This document briefly discusses the two models most favored for the formation of Earth's atmosphere and compares the present-day atmosphere to the early oxygen-lacking atmosphere. Links to related topics are included. Full description.

This document presents a number of theories, both plausible and implausible or even humorous, for the extinction of the dinosaurs. Links to a glossary are embedded in the text. A reading list and links to related sites are also provided. Full description.

Students can learn about the plants, animals, climatic conditions, and geographic locations that constitute the various biomes and ecosystems of the world. Full description.

This brochure provides an overview of the Aerospace Education Services Program (AESP), which makes available aerospace education specialists to assist educators in enhancing their science and technology programs. A list of regional contacts is provided. Full description.

This publication provides an overview of two NASA funding programs, the National Space Grant College and Fellowship Program (Space Grant) and the Experimental Program to Stimulate Competitive Research (EPSCOR). A listing of contacts for these programs in all 50 states (20 states for EPSCOR), the District of Columbia, and Puerto Rico is provided, as well as a link to the Space Grant homepage. Full description.

This news article examines how scientists are looking at sites on Earth, especially Mono Lake in central California, to see how evidence of past life on Mars might be preserved. A selection of links to related topics is provided. Full description.

This biographical index provides short descriptions of the lives and achievements of prominent astronomers, physicists, mathematicians, and other persons who have made contributions to astronomy. Links to related persons and topics are embedded in the text. Full description.

This article explains how the TOPEX/Poseidon satellite has been used to measure changes in sea level due to heat storage in the ocean. The satellite is able to measure and compensate for the effects of solar and lunar tides so that the data can be used for the study of ocean circulation. Full description.