The Wayback Machine - https://web.archive.org/all/20050531082541/http://www.exploratorium.edu:80/ronh/weight/photos.html

Photo Credits

Mercury - Astrogeology Team, U.S. Geological Survey
Venus - No attribution (probably NASA)
Moon - No attribution
Mars - Space Telescope Science Institute
Jupiter - NASA Jet Propulsion Lab taken by Voyager 1
- Io - NASA Jet Propulsion Lab taken by Galileo
- Europa - NASA Jet Propulsion Lab taken by Galileo
- Ganymede - NASA Jet Propulsion Lab taken by Galileo
- Callisto - No attribution, probably NASA Jet Propulsion Lab taken by Voyager
Saturn - NASA Jet Propulsion Lab taken by Voyager 2
Uranus - NASA Jet Propulsion Lab taken by Voyager 2
Neptune - NASA Jet Propulsion Lab taken by Voyager 2
Pluto - Space Telescope Science Institute