If you like these, there are more discussions available. Web Sites Astrophysical Data Service Incredibly useful archive of references nearly all astronomy and astrophysics journals. Abstracts and some full articles are available. Search by author, keyword or title. For the professional NASA Homepage The Web hub for the Space Agency.
Page is useful and well formatted.
Links to public interest pictures, sounds, video. Links to major NASA centers. Links for space related technologies. Best site for cool images. The magazine, on-line.