EVENTS For information on JPL tours and the speakers bureau, visit our PUBLIC SERVICES site. The Solar System Ambassador Program sponsors events in communities around the country. Find out how to become a volunteer Solar System Ambassador.		Topic - Comet Exploration and Research Deep Impact: Cratering a comet to release our past Presented by Don Yeomans Manager, NASA's Near Earth Object Program Office Click here for Archived Webcast.   If you don't have Quicktime, you can download free Quick Time 6.5   Thursday, July 21 The von Kármán Auditorium at JPL 4800 Oak Grove Drive Pasadena, CA For directions, click here. Friday, July 22 The Vosloh Forum at Pasadena City College 1570 East Colorado Blvd. Pasadena, CA For directions, click here. Both lectures begin at 7 p.m. PDT and run for approximately an hour. Admission is free. Seating is limited. For more information, call (818) 354-0112. Comets are time capsules that hold clues to the formation of the solar system. The Deep Impact mission will probe beneath the surface of Comet Tempel 1 and for the first time, give us a look at the frozen secrets in its interior. In July of 2005, a flyby observing spacecraft will release a second impactor spacecraft into the path of the comet. The resulting crater from this impact could be as large as a football coliseum. Scientists look forward to recording data on both the ice and dust debris ejected from the comet as well as the way in which the crater forms. Observation from the impactor, the flyby spacecraft and telescopes on Earth will be sent to the science team in near real time and combined to answer questions about the structure of comets and our solar system's past. To learn more about comets and current comet missions click here.