Internet Anniversary.

Focuses on astronomical events and its causal role in bringing people online for images and information. Consideration of the impact of Comet Shoemaker-Levy 9 onto Jupiter in 1994 as one of the most spectacular astronomical events; Estimated number of people who had logged on with their modems to download images taken by the newly repaired Hubble Space Telescope and other large instruments on July 16, 1994; Identification of the landing of the Mars Rover Spirit in January 2004 as the latest record-breaking Web event by National Aeronautics and Space Administration.