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Looking for something other than bingo, buffets and belly-flop contests? While oceangoing cruise ships seem to be getting bigger and busier, small-ship cruising has been quietly undergoing a bit of a renaissance.

Something is disturbing the famed, majestic rings of Saturn as well as the lesser-known rings around Jupiter. The ring systems, which appear at first glance to be planar, wafer-thin bands of ice and dust, have on closer examination been found to be rippled, like a corrugated tin roof.