Some are almost spheres, like planets, but most are irregular shapes. Some are the size of small stones and pebbles. Some measure hundreds of kilometres across. The largest object is the asteroid ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

"With an orbital period of 570 days, it is a relatively cold gas giant planet," said Guðmundur Stefánsson of the University ...

They had only 36 hours to set up the planets and measure out the orbits. At the scale they are using, the sun measures about a meter and a half across. In reality, the sun's diameter is 1 million ...