How Jupiter and Saturn Formed From Mere Pebbles

Scientists have long puzzled over how our solar system’s planets formed, because this isn’t a process they can watch unfold. Researchers have generally thought that Jupiter and Saturn grew out of collisions of smaller clumps of rock and ice, building up proto-planets called planetesimals. But the prevailing model produced far too many.

Scientists’ new computer model found a way for these massive wonders to form from mere collections of pebbles.

Early Days
When our solar system forme

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