Explorers Program - http://explorers.gsfc.nasa.gov/
Goddard Space Flight Center provides frequent flight opportunities for world-class scientific investigations from space. Includes program history, current missions, and upcoming opportunity schedule. |
NASA's Explorer Missions - http://nssdc.gsfc.nasa.gov/multi/explorer.html
The National Space Science Data Center (NSSDC) provides a summary list of all Explorer missions with links to mission overviews and data. |
Small Explorer (SMEX) Program - http://sunland.gsfc.nasa.gov/smex/index.html
Includes information about the small explorer class of missions including SAMPEX, FAST, SWAS, TRACE, and WIRE. |