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 the exception of Pluto, planets in our solar system are classified as either terrestrial (Earth-like) or Jovian (Jupiter-like) planets. Terrestrial planets include Mercury, Venus, Earth ...

A new study in astrophysics has found why some planets’ paths have certain peculiar features. The formation of the solar ...

Using computer models of the four outer planets ... swooping through the inner solar system, the researchers created an additional 10,000 simulations including the terrestrial planets as well.