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

She mapped our solar system's "alternate fate" had it housed an extra planet between Mars and Jupiter instead of the existing asteroid belt. They developed a 3D model that simulates how the solar ...

Although most simulations created conditions very unlike the current solar system, the researchers found that in approximately 1% of the simulations, the visitor's passage altered the giant ...