Features a summary of the catalog of 338 peculiar galaxy views gathered by Dr. Halton C. Arp. Includes data and links.

View the nebulae, star clusters, and galaxies first discovered by French astronomer Charles Messier in the 1700s.

Images and vital statistics for Messier deep space objects, categorized by object type.

Access a database of celestial objects found outside the Milky Way galaxy. Features names, positions, images, abstracts and related data.

View a collection of digital images of 113 nearby galaxies. Includes a guide to the catalog and a detailed description of the observatories.