Theories surrounding the formation of our solar system are based on many

Theories surrounding the formation of our solar system are based on many Assumptions

Explanation:

An assumption is a fact that is accepted as true but cannot be proven such as using an experiment due to circumstances that setting up such an experiment is beyond human reach. Many assumptions are coined up to back up models used to postulate the formation of the solar system. Examples of models used to suggest solar system formation are the tidal theory, interstellar cloud theory, proto-planet theory, and etcetera.