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You could line up 21 Earths side by side across Saturn’s main rings. They span 270,000 kilometres in diameter. That is massive. But that is not the detail that breaks your brain. The rings are essentially two-dimensional. Despite being wide enough to act as a bridge for two dozen planets, they are only 10 metres thick in most places. You likely have a building on your street taller than the rings of Saturn. They are just a razor-thin sheet of drifting water ice, slowly raining down into the gas giant until there is nothing left.