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.
[/caption]The most widely accepted atom model is that of Niels Bohr. Bohrâs model was first introduced in 1913. This model of the atom depicts a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus much like the planets travel around the Sun, but the electrostatic forces product attraction instead of gravity.