Why are some stellar objects spheres (planets,stars) and others disks (solar systems, galaxies)?
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At the start, everything was a sphere of dust with a random density. The clouds of dust started to pull together because of gravity. Now, it’s not just that individual particles of dust close together pulled and stuck together, but all of the dust everywhere. These means that the localized dust clouds formed into planets and stars, the gravity of the other planets and stars pulled on them as well. This pulls things together into a disk.
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