This web page contains lecture notes about the early universe. It describes the conditions that allowed particles to evolve into large stars and galaxies. The information provided is well organized and it also provides...

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 page from then University of California, Los Angeles Galactic Center Group provides images of the galactic center over most of the electromagnetic spectrum. Each image has explanatory text, and a background section...

This website from the Space Plasma Group at the Massachusetts Institute of Technology provides information on the interstellar medium, the Solar wind, and interactions with the earth. Illustrations and tables are...

This teacher's guide includes a collection of activities intended to accompany the 'The Hidden Lives of Galaxies' poster. The activities deal with the formation, history, and properties of galaxies. Topics include how...