http://blogs.nature.com/news/thegreatbeyond/2010/10/comet_impact_recorded_as_rippl.html
"Mysterious ripples in Jupiter's rings, first observed when the Galileo spacecraft passed by in 1996, were caused by the impact of Comet Shoemaker-Levy 9 into Jupiter in 1994, scientists reported on 5 October, at the annual meeting of the American Astronomical Society's Division for Planetary Sciences, in Pasadena, California.
"The ripples, generated by the gravitational pull of the comet fragments as they slammed into the planet, have evolved over time, progressively winding more and more tightly, like a coiling rope, said Mark Showalter of the SETI Institute, Mountain View, California, and Joseph Burns of Cornell University, Ithaca, New York. By mathematically turning back the clock, the scientists uncovered two sets of ripples, one tracing to 1994, and the other to an unknown event in 1990...."
((("An unknown event in 1990." That's one for the books, Mr. Fort.)))
