The core of this cloud grew under the influence of gravity, becoming denser and hotter...
...and as material fell into the core, the cloud's rotation increased in speed, causing it to become disk-shaped.
Around 5 billion years ago, the solar system was thought to have been formed from a giant cloud of gas composed of gas and dust...
Lighter materials were pushed away from the sun while heavy materials with high melting points remained near it. Dust and molten metals began to clump together in clusters forming rocks.
As temperatures increased, there was enough energy to trigger a nuclear fusion in the core, becoming our sun!
Gravity made these rocks clump to each other, until they become big enough to become planets.
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