This booklet is the product of many scientists, all of
whom have cooperated enthusiastically to bring their best
information about this exciting event to a wider audience. They
have contributed paragraphs, words, diagrams, slides, and
preprints as well as their critiques to this document, which
attempts to present an event that no one is quite sure how to
describe. Sincere thanks go to Mike A'Hearn, Paul Chodas, Gil
Clark, Janet Edberg, Steve Edberg, Jim Friedson, Mo Geller, Martha
Hanner, Cliff Heindl, David Levy, Mordecai-Mark Mac Low, Al
Metzger, Marcia Neugebauer, Glenn Orton, Elizabeth Roettger, Jim
Scotti, David Seal, Zdenek Sekanina, Anita Sohus, Harold Weaver,
Paul Weissman, Bob West, and Don Yeomans.
I also need to thank all those who might have been omitted.
The choice of material and the faults and flaws
in the document
remain the responsibility of the author
The writing and production of this material was made possible
through the support of Jurgen Rahe and Joe Boyce, Code SL,
and of Dan McCleese,
Jet Propulsion Laboratory (JPL).
For help in the layout and production of this booklet, on a very tight
schedule, additional thanks go to the Design Services Group of the
JPL Documentation Section.
All comments should be addressed to the author:
Ray L. Newburn, Jr.
Jet Propulsion Laboratory, MS 169-237
4800 Oak Grove Dr.
Pasadena, CA 91109-8099