The preposition is followed by its object (and words that modify the object in the prepositional phrase). A preposition is a word that occurs before a noun/pronoun in a clause. Preposition means, pre-before and position-the object's location.
The most widely accepted scientific explanation for the formation of the Solar System is called the Solar Nebular Model. According to this model, the entire Solar System formed around 4.5 billion years ago from the gravitational collapse of a small fraction of a giant molecular cloud, also known as a nebula.
Describe the formation of the Solar System to the students. Show them the pictures of a nebula, flattened planetary disk, and the Sun. The key point is that we do not really know how our Solar System was formed, although most evidence points to the nebula theory. Below is a shorten story of two different ways the Solar System could have formed.