The nebular theory, which explains the formation of our solar system, has a long and complex history with contributions from many scientists. While there isn't one single creator, Immanuel Kant and Pierre-Simon Laplace are often credited as the key figures who first proposed it in the 18th century.

Here's a breakdown:

* Immanuel Kant (1755): Kant proposed a theory of the solar system's formation based on a rotating cloud of gas and dust, which he called a "nebula". His theory suggested that the nebula would cool and condense, eventually forming the sun and planets.

* Pierre-Simon Laplace (1796): Laplace independently proposed a similar theory, suggesting that the nebula would spin faster as it contracted, eventually shedding rings of matter that would coalesce into planets.

While their ideas laid the foundation, the nebular theory has been refined and expanded upon by numerous scientists over the centuries. Key contributions include:

* The discovery of meteorites: These rocky fragments from space provided evidence of the composition of the early solar system.

* The development of spectroscopy: This allowed scientists to study the composition of stars and planets.

* The understanding of gravitational collapse: This provided a physical explanation for the formation of the sun and planets.

Today, the nebular theory is the most widely accepted model for the formation of our solar system. It is constantly being refined and updated as new discoveries are made.