The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

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

The eight planets in our solar system orbit the sun in roughly the same plane, because they all originally formed from the ...

The research, yet to be peer-reviewed, sheds light on what could have changed the orbits of several planets in the solar ...