Stardome is a free download for sky features
Download of PDF star charts from the Stephen F. Austin State University observatory and free downloads of astronomy software.
This website is an overview of the history, mythology, and current scientific knowledge of the planets, moons and other objects in our solar system. Each page has text and NASA's images.
An outline of links leads you through the topics.
Wikipedia article on astronomy.
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer
Yahoo links to a number of astronomy topics, and to free software