Final answer:
The widely accepted model for the solar system's formation is the Nebular Hypothesis, which posits that it formed from a collapsing solar nebula 4.5 billion years ago.
Step-by-step explanation:
The most widely accepted model of the formation and evolution of our solar system is the Nebular Hypothesis. This model suggests that the solar system formed from the collapse of a rotating cloud of gas and dust, known as the solar nebula, about 4.5 billion years ago. As the nebula collapsed under its own gravity, material fell toward the center, forming the Sun, with the remainder of the nebula eventually forming the planets, their moons, asteroids, and comets.