Dallas shows an orrery – a mechanical model of the solar system. Before the 17th century most people believed in a geocentric model of the solar system. Dallas explains the geocentric model and ...

This model of solar system formation is known as the nebular hypothesis. The solar system is structured in a roughly flat plane called the ecliptic, with most planets orbiting the sun in the same ...

Save guides, add subjects and pick up where you left off with your BBC account. The Solar System is the name given to the part of space that surrounds the Sun. Even though it is bigger than ...