Learner Express: Modules for Teaching and Learning
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How did the Earth and other planets form? Clouds of dust and gas in a solar nebula collapsed under the force of gravity, making a flat, spinning disk with the Sun at the center. Planets coalesced out of the remaining material, still locked today in the flat plane of the original disk.
The various planets are thought to have formed from the solar nebula, the cloud of gas and dust left over from the Sun's formation. View Video
The solar system started to form when clouds of dust and gas collapsed, under the force of gravity, into a flat, spinning disk. View Video