The document summarizes the formation of the solar system based on the nebular hypothesis. It explains that the solar system formed from the gravitational collapse of a giant gas and dust cloud about 4.6 billion years ago. As the cloud collapsed and spun faster, the heavier elements collected in the center to form the inner terrestrial planets, while the outer parts formed the outer gaseous jovian planets. Over time, small particles collided and merged to form larger bodies called planetesimals, which eventually formed the planets.