Space Rock That Fell to Earth Reveals Ancient Traces of Early Solar System

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Space Rock That Fell to Earth Reveals Ancient Traces of Early Solar System
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A lot as changed in the 4.5 billion or so years since the Solar System first came together from a disk-shaped cloud of swirling dust and gas.

The basic components of that initial, early dust disk are therefore difficult to discern. But not, as it happens, entirely impossible. The Sun, like all stars, was born in a cloud of dust. A denser knot in the cloud collapsed under its own gravity, spinning, spooling the material around it into a disk that fed into the growing star.

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