who the model is named after and evidence for the model. Could be used to explain the size and scale of the Solar System. Students could write a description of the scale and size of the solar ...

This may explain the strange properties of the orbits of our solar system's planets, which are not quite perfectly circular, and all lie on slightly different planes. NASA artist’s conception of ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...