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 ...

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

perfectly aligns with Mars and obscures the red planet due to its larger apparent size in the sky. "If you can see only one celestial event this January, see this one," the Astronomical League ...