Transcription: Some four and a half billion years ago, near the outer reaches of the Milky Way, a huge cloud of gas and dust begins to condense. Billions of miles across, the cloud collapses into a flat spinning disk, the solar nebula. Within the disk, particles collide and adhere, and the primordial sun and planets struggle to emerge. As the sun ignites, it blows away most of the gas from the inner solar system, and only hot, rocky worlds remain. Enormous collisions shape the planet we will one day call Earth. Perhaps one last This immense impact spins off matter that will become the moon. The Earth begins ...
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