Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a ...

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

In either case, Jupiter's gravity played and still plays a major role in clearing out the inner Solar System of the largest ...

This new research, however, focuses on a second possibility: that the organic material formed within Ceres and has been stored in a reservoir shielded from solar ... in the inner solar system ...

Understanding how the habitability of our solar system's inner planets—Mercury, Venus, Earth and Mars—would change had there been a super-Earth opposite Mars can help guide astrobiologists ...