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

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

Stargazers will be treated to a dazzling six-planet "alignment" this January.

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

Found by Dr Michael Cretignier of the University of Oxford, the planet has a mass six times greater than Earth's and orbits ...

A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

Although it's being mistakenly promoted as a "rare planetary alignment," one of the best "planet parades" in half a century ...

Stargazers, prepare for the parade of planets that will take place over the next few nights in the sky. Here's what you need ...