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

Astronomers say they have figured out the true chemical makeup of our solar system, revealing that it contained much more carbon, oxygen and nitrogen than previously thought. Chiefly, the finding ...

Mars remains a true puzzle, but not for the reasons most people ... Mars reached half its mass very early on in the history of our solar system. Basically, whatever the source of the size ...