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

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

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

To better understand why the planets have variable compositions, we have to first understand the process of how stars form. While the composition of gas and dust in a precursor molecular cloud is ...

The different speeds of the planets mean that ... a star from our point of view it dims the star's light, allowing its size and orbit to be discerned. Thanks to this method, we have discovered ...

Yes, six planets will be visible in the January night sky. And yes, they'll be in a line. But because planets always appear in a line from our Earth-bound vantage, the alignment isn't anything out ...

The new exoplanet, Enaiposha, also known as GJ 1214 b has never been seen before and is now officially being called a "Super-Venus." ...

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.