National Space Science Data Center (NSSDC) Home Page The Astronomical Data Center provides astronomical catalogs and journal tables to the scientific community. The site includes nine data categories: astrometric and...

Authored by Nick Strobel, "Astronomy Notes" is an educational resource for introductory astronomy classes for undergraduates. This section discusses refracting, reflecting, and radio telescopes. Definitions and...

Welcome to the NASA/IPAC Extragalactic Database (NED). It is built around a master list of extragalactic objects for which cross-identifications of names have been established, accurate positions and redshifts entered to...

This web site contains information on the use of different wavelength filters to determine astronomical information by the Hubbble Space Telescope. The use of color to enhance black and white images is included. The...