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 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...

This educators guide provides content and classroom activities about galaxies, galaxy morphology, x-ray properties of galaxies, and evidence for dark matter in galaxies. The classroom activities have been designed to be...

This resource covers the nature and components of the Milky Way, including the disk, spiral arms, nucleus, dark matter halo, globular clusters, and central bulge; the interstellar medium, including gas, dust, HI and HII...