Discover the order of planets in the solar system ... in their orbits and becoming the planets we know today. This model of solar system formation is known as the nebular hypothesis.

the descriptions of the Solar System had to get very complex in order to keep the Earth at the centre. Nicolas Copernicus (1473-1543) is generally credited with changing the model of the Solar ...

Narrator: Serious scientists, like myself, believe our solar system was formed by the collapse ... This theory was known as the heliocentric model. It was controversial as accepted wisdom at ...