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

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event ...

Six of the planets in our solar system will line up, in what is sometimes called a 'planetary parade'. They include Venus, ...

FOUR planets are visible in the night sky. You will have to battle January clouds, but here is how to find them.

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

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests.