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

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

The eight planets travel around the Sun at different speeds. These lines show us the paths they take which we call orbits. On a clear night from Earth we can sometimes see the five planets which ...

Mars will be making its closest approach to Earth in two years, and thus, the mighty red planet, named for the god of war ...

Six planets will be visible to the naked eye and eight can be seen if you have a telescope or binoculars. The celestial event is called a planetary parade. The planetary parade is a celestial ...