A centre that provides access to science data from NASA's space flight missions. This information, which can be seen online without cost, includes astrophysics, solar physics, space plasma, lunar, and planetary data. Established in 1966, NSSDC is part of the Space Science Data Operations Office at NASA's Goddard Space Flight Center.

http://science.nasa.gov/national-space-science-data-center Website of the NSSDC.