Orrery: Solar System Simulator
A Java applet that simulates gravitating masses. Features a working model with motions and sizes of 70 planets and moons to scale.

SkyScopes
Information about planetary astronomy and space exploration and habitat. Online chat, message boards, and related links. Sells replicas and toys.

Orrery: The Solar System in Action
A concise tour containing numerous educational resources, and support for Spacetech's Orrery application.

Endless Boundaries
Information on the Sun, planets and moons.

Solar System Discoveries by JJ Kavelaars
References to minor planets and moons of planets that were discovered by JJ Kavelaars.

The Solar Space Station
Facts, descriptions and pictures, with sections about the Sun, the planets and meteors and asteroids.

Views of the Solar System
Comprehensive multimedia tour with statistical data, detailed information, pictures and videos. Also includes educational resources.

Solar System Dynamics
Web-based resources accompanying the book Solar System Dynamics, by Carl D. Murray and Stanley F. Dermott.

A Planet Pursuit
Pictures, facts and general information on the nine planets.

Solar System Simulator
Shows the position of Venus, Earth and Mars at any date from 1900-2100.

BBCi Space: Solar System
3D tour including videos with audio and text information on the Sun and the bodies orbiting around it. (Shockwave and Realplayer required)

Stardate Online: Guide to the Solar System
Contains an outline of the formation and evolution of planets, comets, asteroids, and of their features and exploration.

Astronomy 161: The Solar System
Overview with historical background and basic astronomy concepts, details about planets, satellites, asteroids, comets and meteors.

Solar System Dynamics
Provides detailed information related to known bodies in orbit around the Sun. Ephemerides, physical parameters, Earth close-approaches, observer tools.

Welcome to the Planets
Select images from NASA's planetary exploration program.

Our Solar System
Basic information and low resolution pictures of the bodies of our planetary system.

Aniket World
Personal page reporting basic features of the planets and some links.

The Solar System in Pictures
Quizzes and images about all the bodies of our planetary system.

Solar System Simulator
Online software that generates views of the bodies of our planetary system at any date from any artificial or natural point of observation.

USGS Astrogeology Research Program
Features planetary imagery, research, GIS, mapping, and image processing software. The site provides information about the group and about the Solar System.

The Planetary Society: Solar System Guide
Current and concise information about all planets, major satellites, comets and asteroids.

Planetary Fact Sheet
Table of essential measurements and facts regarding the nine planets with links to highly detailed summaries.

Northeast Regional Planetary Data Center
Includes list of available image collections and how to obtain the data at the facility (no images are online).

Astronomy Today - Solar System
Fairly detailed information about our sun and its planets.

The Solar System
History of and basic facts about major solar system bodies.

The Solar System
Detailed guide to the sun and planetary system, asteroids, comets, meteor hits on Earth and the other planets.

Solar System Exploration Home Page
The Solar System Exploration Home Page is part of NASA's Office of Space Science and describes NASA's program to explore the solar system.

About Atmosphere
Summary information regarding the atmospheres of each planet in our solar system.

Rotation of Sun and Planets
The rotation period of a large body circled by one or more satellites can be calculated theoretically.

Planetary Science Institute
Research and educational institute with projects to study planets, asteroids, and comets.

Uranus, Neptune, and Pluto
Journey to the outer reaches of the solar system and discover what scientists have learned about Uranus, Neptune, and Pluto.

Windows to the Universe
Aimed at portraying Earth and Space Sciences in a fun way. Includes information about space weather, global space physics and a real time movie of current solar activity.

Free Software for Planetary Science
Image processing browers for Mariner 6, 7, 9, 10, Venera 15/16, and Viking Orbiter.

DiscoverThePlanets.Com
Various images, brief information, moons, summaries of past and planned missions.

Planetary Cartography and Graphics by Ralph Aeschliman
Planetary maps and graphics of Mars, the Moon and Venus.

Solar System - Celestial Mechanics
A theory about the rotation of sun and planets, planetary rings, origin of solar system, solar cycles and climate variations.

Virtual Solar System
Images, facts and quizzes about the nine planets. Also includes a scale model.

Smiley's Planet
Explore the solar system's planets. Includes pictures, descriptions, statistical information and a special section on the latest voyage to Mars.

The Nine Planets
Overview, sections dedicated to each planet and the smaller bodies - with data, information and some pictures - glossary and appendices.

Universe, the Unknown World
Information on the solar system, with points about universal history and future.

Distributions of the Planets and Moons Orbits
Discussion paper offering a theory of orbital distances including Solar system with Pheaton and the Kuiper Belt.

Gazetteer of Planetary Nomenclature
Protocols for naming planetary features, by the Working Group for Planetary System Nomenclature of the International Astronomical Union.

Exploring the Planets
Sponsored by the National Air and Space Museum, contains many interesting facts about the planets, pictures, comparisons and a section dedicated to spacecraft.

Planetary Materials Curation
Features Moon rocks, Mars meteorites, and space exposed materials at NASA's curation office.