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Space sciences/Planetary science/Exoplanetary science/Astrogeology/Planetary rings

In 1983, an unseen comet struck the rings of Saturn. Almost a decade later, a comet collided with Jupiter. These events tilted and left residual ripple patterns in the rings of both planets, according to a pair of papers in Science that piece together a planetary puzzle.

Published online at ScienceExpress, the studies indicate that a planet’s rings can act like a giant record, preserving the effect of every passing comet. Studying the subtle spiral patterns these comets leave behind allows scientists to play back the history of impacts years and even decades later.

After six years of up-close observations, the Cassini space mission is painting the most detailed picture ever of Saturn and its complex ring system.