The University of Alabama has created this website contains many images of Messier objects, galaxies, interacting galaxies, active galaxies, clusters, comets, and interstellar material. Each image links the user to more...

This 2-page color fact sheet briefly describes NASA-s Kepler mission, its instruments, and ground system. Also included are tables listing the instrument parameters and a listing of the major institutions involved....

Teachers can use this website to teach students about this recently revised map of the universe which illustrates recent discoveries, ranging from Kuiper belt objects in the Solar system, to the galaxies and quasars from...

This site, created by the National Aeronautics and Space Administration, offers user-friendly, continuously-updated access to approximately 2,000 images from various solar system exploration programs. Users can select...

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...