Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

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

A new study suggests that a close encounter with a massive interstellar object, possibly eight times the mass of Jupiter, may ...

The Sun is the largest object in the Solar System. The Sun’s huge gravitational field keeps many other objects – planets, dwarf planets, asteroids and comets – in orbit around it.

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.

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet ... Pluto and Charon are in a region of the outer solar system beyond Neptune called the Kuiper ...