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| Astrobiology Magazine | Articles, images, and links related to life on other planets. |
| Astrobiology Web | SpaceRef Interactive. News, information about missions, links to newsgroups, etc. |
| Astronomy Resources | Bob Jackson, Space Telescope Science Institute. Annotated links. |
| AstroWeb | More than 3,000 links to astronomy/astrophysics sites. |
| Atlas of the Universe | Richard Powell. Nine maps of the universe, annotated links, glossary. |
| Atmospheric Optics | High quality photographs of atmospheric optical phenomena. |
| Cambridge Relativity | University of Cambridge. Links to webpages on astronomy. |
| Constants and Equations Pages | Providing comprehensive sources for information on constants and equations, as well as much, much more. There are currently over 10,800 pages of information. |
| Cosmic Evolution | Tufts University. The history of the universe, based on Eric Chaisson's book. Text, images, movies, links. |
| Digital Lunar Orbiter Photographic Atlas of the Moon | Universities Space Research Association. Links to the Lunar Orbiter, provides statstical information. |
| European Space Agency | Information about ESA projects and member country activities, articles about astronomy etc, news, images and videos, etc. |
| Extrasolar Planets Encyclopedia | Jean Schneider, Observatoire de Paris. |
| The Galileo Project | Rice University. Images, biographies, historical documents, and Galileo's works. Links to information about astronomers of Galileo's time and modern astronomy. |
| Gazetteer of Planetary Nomenclature | USGS. Alphabetical list as well as a list organized by planetary body. Bibliography. |
| Green Flash Page | Andrew T. Young, San Diego State University. Photographs, simulations, and clarification about crepuscular rays, explanations, advice on how to best see one, and facts debunking common misconceptions about green flashes. Also an annotated bibliography on green flashes, mirages, and related atmospheric refraction phenomena as well as an extensive list of links to related sites. |
| Mars 2001 Odyssey THEMIS | Information about the mission (geology of Mars), instruments used, images, etc. |
| The Nine Planets | University of Arizona. Narrative, factual, and graphic information about each planet, the sun, and other bodies in the solar system. Links. |
| Physical Sciences Information Gateway | Consortium of Academic Libraries. News and annotated links. |
| The Planetary Society | Essays, news, information about projects, etc. |
| A Space Library | NASA/JBL/Caltech. Surface maps of the planets and satellites, artwork, solar system simulator, etc. |
| Space Policy Project | Federation of American Scientists. Information on and analysis of civil and military space issues, policies and programs. |
| Space Weather | University Corporation for Atmospheric Research (UCAR). A component of the Windows to the Universe project, in collaboration with WeatherNet 4 and Rice Connections projects. |
| Space Weather | Information, news, and and forecasts on solar storms, flares, and winds; auroras; sunspots; and interplanetary magnetic fields. |
| Sun-Earth Viewer | University of California Berkeley. Current solar images, videos on solar-planet interaction, and information on related subjects. |
| Views of the Solar System | Calvin J. Hamilton. Information on the Sun, planets, moons, comets, asteroids, and more. |
| Windows to the Universe | University of Michigan. Info on Earth science, space science, historical figures in science, and more. |
| World Wind | Lets you zoom from satellite altitude into any place on Earth. |