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Small Rocks Build Big Planets

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Saturn from Cassini spacecraft

Image of Saturn and its rings taken by the Cassini spacecraft on 15 April 2008.

Credit: NASA/JPL/Space Science Institute

The biggest planets in the Solar System may have gotten their start from the smallest of rocks: centimetre-sized pebbles that formed 4.5 billion years ago from dust and ice swirling around the newborn Sun.

From Nature
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