For information about and images from Hubble, this is definitely the site you should start with. You'll find a history of Hubble, news releases, educational activities, and information about its observations and instruments. (Maintained by Space Telescope Science Institute.)

The SEDS web site explains the goals and goings-on of the organization: an independent, student-based organization promoting the exploration and development of space. It also provides links to a wide variety of educational and research resources related to astronomy, space sciences and rocketry. (Maintained by the University of Arizona chapter of SEDS.)

This site provides information about our solar system to the general public and is easy to understand for people with little technical background. Learn about the history, mythology, and current scientific knowledge of each of the planets and moons in our solar system. Text on this site is enhanced with the use of images, sound, and video clips, and there are references to related information. All technical and astronomical terms and proper names are defined in the glossary. (Maintained by William A. Arnett.)

This well-organized site offers astronomy-related data (like "Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year," "Phases of the Moon," "Recent and Upcoming Eclipses of the Sun and Moon," "Altitude and Azimuth of the Sun or Moon During One Day," "Celestial Navigation Data," and "Orbital Elements of Asteroids."), research reports available for downloading (like "The Motion of Mars' Pole," "Prospects for Determining Asteroid Masses" and "High Precision Algorithms for Astrometry"), and Frequently Asked Questions (about Phenomena of the Sun and Moon, about Time, about Calendars and Historical Events, and about Computing Astronomical Phenomena). (Maintained by U. S. Naval Observatory.)

Categories of information found here include observations, data, publications, people (including jobs and conferences), organizations, software, research areas of astronomy (radio, optical, space, solar, planetary, and high energy), lists of resources, astronomical imagery, education, and history. (Maintained by Sergio Paoli, La Plata Observatory.)