document: Ripples in Saturn and Jupiter rings '' `` caused by comet crashes '' '' Ripples in Saturn 's rings date back to 1983 Jupiter 's rings were disrupted in 1994 Scientists have traced ripples in the ring systems of Saturn and Jupiter back to collisions with comets more than ten years ago . The ripples detected in Saturn 's rings date back to 1983 , while the disruption to Jupiter 's lesser-known rings was caused in 1994 , Nasa researchers believe . The culprit , in the case of Jupiter , was comet Shoemaker-Levy 9 , whose debris cloud hurtled through the planet 's thin ring system during a kamikaze course into the planet in July 1994 . Scroll down for video Saturn 's ripples were caused by a similar object - likely another cloud of comet debris - plunging through the inner rings in the second half of 1983 . Lead author Dr Matthew Hedman , from Cornell University , New York , said : '' `` What 's cool is we 're finding evidence that a planet 's rings can be affected by specific , traceable events that happened in the last 30 years , rather than a hundred million years ago . '' `` The solar system is a much more dynamic place than we gave it credit for . '' '' From Nasa orbiter Galileo 's visit to Jupiter , scientists have known since the late 1990s about patchy patterns in the Jovian ring . But the Galileo images were fuzzy , and so did n't explain why such patterns would occur . The trail was cold until Cassini entered orbit around Saturn in 2004 and started sending back thousands of images . A 2007 paper by Dr Hedman and colleagues first noted corrugations in Saturn 's innermost ring , dubbed the D ring . A group including Dr Hedman and Dr Mark Showalter , from the SETI Institute in Mountain View , California , then realised that the grooves in the D ring appeared to wind together more tightly over time . Playing the process backward , Dr Hedman then demonstrated the pattern originated when something tilted the D ring off its axis by about 100metres in late 1983 . The scientists found the influence of Saturn 's gravity on the tilted area warped the ring into a tightening spiral . Cassini imaging scientists got another clue when the sun shone directly along Saturn 's equator and lit the rings edge-on in August 2009 . The unique lighting conditions highlighted ripples not previously seen in another part of the ring system . Whatever happened in 1983 was not a small , localised event - it was big . The collision had tilted a region more than 12,000 miles wide , covering part of the D ring and the next outermost ring , called the C ring . Unfortunately , spacecraft were not visiting Saturn at that time , and the planet was on the far side of the sun , hidden from telescopes on or orbiting Earth , so whatever happened in 1983 passed unnoticed by astronomers . Dr Hedman and Dr Showalter began to wonder whether the long-forgotten pattern in Jupiter 's ring system might illuminate the mystery . Using Galileo images from 1996 and 2000 , Dr Showalter confirmed a similar winding spiral pattern . They applied the same maths they had applied to Saturn - but now with Jupiter 's gravitational influence factored in . Unwinding the spiral pinpointed the date when Jupiter 's ring was tilted off its axis to between June and September 1994 . Shoemaker-Levy plunged into the Jovian atmosphere during late July 1994 . The estimated size of the nucleus was also consistent with the amount of material needed to disturb Jupiter 's ring . The Galileo images also revealed a second spiral , which was calculated to have originated in 1990 . Images taken by New Horizons in 2007 , when the spacecraft flew by Jupiter on its way to Pluto , showed two newer ripple patterns , in addition to the fading echo of the Shoemaker-Levy impact . '' `` We now know that collisions into the rings are very common - a few times per decade for Jupiter and a few times per century for Saturn , '' '' Dr Showalter said . '' `` Now scientists know that the rings record these impacts like grooves in a vinyl record , and we can play back their history later . '' '' The ripples also give scientists clues to the size of the clouds of cometary debris that hit the rings . In each of these cases , the nuclei of the comets - before they likely broke apart - were a few kilometres wide . The findings are detailed in a pair of papers published online today in the journal Science .
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