National Space Science Data Center (NSSDC) - http://nssdc.gsfc.nasa.gov
The National Space Science Data Center (NSSDC) now has a WWW homepagewith a significant amount of information about all of NASA's data setsfrom planetary exploration, space and solar physics, life sciences,astrophysics, including many links to other sites. This is probably themost useful place to start for people interested in data mining ofNASA's vast scientific data sets.
Note: This info converted from the original "The Data Mine" pages and pre-dates June 2001. Please remove this note if you update or check the info