NASA
Nasa Star Child: Probes to the Outer Planets (Level 2)
This site has a description of the many probes sent to the outer planets, including pictures and vocabulary words linked to a glossary of terms. Other links on interesting facts and more detailed information are also included.
NASA
Nasa: Missions: Jupiter: Pioneer 11
Following closely after Pioneer 10, this was the second mission to visit Jupiter. This website provides background information about the mission and links to more detailed data.
NASA
Nasa: Mission Archives: Pioneer Project
This is the home page of NASA's Pioneer Project. Content includes a general overview of the probes' missions, news, and history.