What would it be like to orbit a black hole—or even to fall into one? You can find out by exploring the world of black holes in a Web site created by a team at the Space Telescope Science Institute in Baltimore, Md. For a fully interactive multimedia experience, click “Journey to a Black Hole” (fast Internet connection recommended). For an in-depth study of black holes that presents the site’s contents conveniently sorted by topic, click “Black Hole Encyclopedia.”