Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Temperamental' stars that brighten and dim over a matter of hours or days may be distorting our view of thousands of distant planets, suggests a new study.

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.

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

This places it between Earth and Neptune in a size range that typically divides exoplanets ... expands our understanding of the diversity of planets (just like this strange object in our Solar System) ...

For the first time, astronomers have imaged dozens of belts around nearby stars where comets and tiny pebbles within them are ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

An object we thought belonged to the most common category of planet in the galaxy has turned out to be something we've never seen before.

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...