MONIST THEORIES :

In this, the origin of the solar system is believed to have taken place from a single star or nebula. The chief protagonists of this school of thought are Kant, Kuiper, Hoyle Weizsacer, Laplace and Lockyer.

1. Immanuel Kant’s Gaseous Hypothesis
2. Nebular Hypothesis
3. Big Bang Theory
4. Giant Impact Hypothesis