Northeast Regional Planetary Data Center
- Includes list of available image collections and how to obtain the data at the facility (no images are online).
- http://www.geo.brown.edu/BrownNASADataCenter/Home.htm

Solar System Ephemeris
- Providing ephemeris of a variety of Sun orbiting bodies.
- http://www.arnaudxx.net/

Astromaterials Curation
- Features Moon rocks, Mars meteorites, and space exposed materials at NASA's curation office.
- http://curator.jsc.nasa.gov/

Computing Planetary Positions
- A detailed online tutorial on how to compute planetary locations using math formulas.
- http://stjarnhimlen.se/comp/ppcomp.html

The Planetary Society: Our Solar System
- Concise information about all planets, comets and asteroids.
- http://www.planetary.org/explore/topics/groups/our_solar_system/

Nova Celestia
- Provides overview and original illustrations of elements.
- http://www.novacelestia.com/space_art_solar_system.html

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.
- http://www.nasm.si.edu/ceps/etp/

Gazetteer of Planetary Nomenclature
- Protocols for naming planetary features, by the Working Group for Planetary System Nomenclature of the International Astronomical Union.
- http://planetarynames.wr.usgs.gov/

Smiley's Planet
- Explore the solar system's planets. Includes pictures, descriptions, statistical information and a special section on the latest voyage to Mars.
- http://www.d.smiley1.btinternet.co.uk/

Virtual Solar System
- Images, facts and quizzes about the nine planets. Also includes a scale model.
- http://www.solarsystem.org.uk/

Planetary Cartography and Graphics by Ralph Aeschliman
- Planetary maps and graphics of Mars, the Moon and Venus.
- http://ralphaeschliman.com

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.
- http://www.windows.ucar.edu/

Planetary Science Institute
- Research and educational institute with projects to study planets, asteroids, and comets.
- http://www.psi.edu/

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.
- http://solarsystem.nasa.gov/index.cfm

The Solar System
- History of and basic facts about major solar system bodies.
- http://www.evula.org/solarsystem

Astronomy Today - Solar System
- Fairly detailed information about our sun and its planets.
- http://www.astronomytoday.com/astronomy/solarsystem.html

Planetary Fact Sheet
- Table of essential measurements and facts regarding the nine planets with links to highly detailed summaries.
- http://nssdc.gsfc.nasa.gov/planetary/factsheet/index.html

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.
- http://astrogeology.usgs.gov/

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.
- http://space.jpl.nasa.gov/

The Solar System in Pictures
- Quizzes and images about all the bodies of our planetary system.
- http://www.the-solar-system.net/

Welcome to the Planets
- Select images from NASA's planetary exploration program.
- http://pds.jpl.nasa.gov/planets/

Solar System Dynamics
- Provides detailed information related to known bodies in orbit around the Sun. Ephemerides, physical parameters, Earth close-approaches, observer tools.
- http://ssd.jpl.nasa.gov/

Astronomy 161: The Solar System
- Overview with historical background and basic astronomy concepts, details about planets, satellites, asteroids, comets and meteors.
- http://csep10.phys.utk.edu/astr161/lect/

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.
- http://stardate.org/resources/ssguide/

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)
- http://www.bbc.co.uk/science/space/solarsystem/index.shtml

A Planet Pursuit
- Pictures, facts and general information on the nine planets.
- http://homepage.eircom.net/~aidanbarry/planetpursuit/

The Solar Space Station
- Facts, descriptions and pictures, with sections about the Sun, the planets and meteors and asteroids.
- http://www.solarspace.co.uk/

Orrery: The Solar System in Action
- A concise tour containing numerous educational resources, and support for Spacetech's Orrery application.
- http://www.harmsy.freeuk.com/orrery.html

SkyScopes
- Information about planetary astronomy and space exploration and habitat. Online chat, message boards, and related links. Sells replicas and toys.
- http://www.skyscopes.com/

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.
- http://www.cuug.ab.ca/~kmcclary/