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 ...

An Egyptian astronomer called Ptolemy (AD100-168) described one of the earliest ideas for how the Solar System is structured. Ptolemy’s model and many earlier ideas of the Solar System had the ...

But with some of them nice rings going around it ... Dallas shows an orrery – a mechanical model of the solar system. Before the 17th century most people believed in a geocentric model of ...