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Watch this video on the NASA Goddard YouTube channel.
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This video explores how Saturn is losing its rings at a rapid rate, and what that also reveals about the planet's history.
Infrared observations of Saturn were recorded using the 10-meter diameter Keck telescope in Hawaii. Through a careful analysis, Dr. James O'Donoghue and his team found a series of unusual bright and dark bands extending around the planet's upper atmosphere. It was found that these bands are linked to Saturn's rings by magnetic field lines, indicating that water ice from the rings is \"raining\" into the planet.
This mechanism is called \"ring rain,\" and was discovered using Voyager spacecraft data in the 1980s by study co-author Dr. Jack Connerney. In this process, electrically charged icy dust in Saturn's rings is pulled into the planet along magnetic field lines by gravity. Modeling work by study co-author Dr. Luke Moore shows that if there is a small amount of rain, the ionosphere glows, while if there is a large amount of rain, it becomes dark.
In this new study, the rate of water flow into the planet is estimated to be one Olympic sized swimming pool every half an hour, meaning Saturn's rings will be gone in under 300 million years. This is short relative to the 4.5 billion-year age of the solar system. The findings suggest that giant planetary ring systems are not built to last forever.
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