In which order did the events forming our solar system occur? the solar nebula flattened into a rotating disk. as gas became hot and dense, it spun faster and faster and was pulled toward the center, forming the sun. gas was pulled toward the center, forming the sun. gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. gas was pulled toward the center, forming the sun. the solar nebula spun faster and faster and flattened into a rotating disk. most of the gas was pulled toward the center, where it became hot and dense, forming the sun.