Authored by Nick Strobel, this chapter covers the characteristics of other normal galaxies, active galaxies, and finding distances to other galaxies, including the distance-scale ladder. It also includes large-scale...

Created by William Keel of the University of Alabama, this site offers a large amount of information concerned with Seyfert galaxies, radio galaxies, and Quasars. Under each topic are about a dozen links to images with...

This site is an astronomy tutorial posted by Gene Smith, a professor at UC San Diego. The site contains information on quasars and active galaxies. Information is included on gravitational lensing, black holes, and...

This website, from the National Radio Astronomy Observatory (NRAO), is an image gallery of the enormous mass at the center of the Milky Way galaxy. Each image is accompanied by a several-paragraph explanation. Links to...

This Sloan Digital Sky Survey (SDSS) project teaches students how to detect asteroids using the pictures taken by the survey. The first asteroid was discovered in 1801 by Giuseppe Piazzi, and since then many more have...