How do planets form?
In: 5
Stars form from big clouds of dust and gas. Most of the material ends up in the center as part of the star, as gravity pulls it in. There’s some left over that doesn’t make it into the center, and it forms a disk around the new star. Stuff collides in the disk, and some of it sticks together. As the clump of stuff gets bigger, its gravity attracts more stuff to collide with it. Eventually it gets big enough that gravity pulls it into a roughly spherical shape. If it gets big enough, all the stuff near its orbit either becomes part of it or gets thrown out of the disk.
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