Final answer:
Laplace added to the Nebular Hypothesis by suggesting that our solar system formed from the gradual contraction of a cloud of gas and dust.
Step-by-step explanation:
Laplace added to the Nebular Hypothesis by suggesting that our solar system formed from the gradual contraction of a cloud of gas and dust. His idea, known as the Nebular Hypothesis of Laplace, proposed that a rotating disc of gas and dust gradually contracted and flattened to form the Sun and the planets.