NASA offers these images from the Hubble Space Telescope and the Galileo Project. Simultaneous observations at Hubble and NASA's Infrared Telescope Facility on Mauna Kea, Hawaii have also provided glimpses into Neptune's huge storms and equatorial winds of 900 mph. The site provides a press release, images, and a Quicktime animation.

Offered by the National Space Science Data Center of NASA, the Planetary Fact Sheets Web site contains helpful information for students studying astronomy. The site lists links to all of the planets, their satellites, and their rings, as well as to tables comparing all the planets. The planet pages contain a photograph and a simple list of dozens of facts such as mass, volume, distance to the...