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 ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Mercury joins the night sky to complete a 7-planet alignment just after sunset for the end of February. Saturn leaves our ...

Stargazers will be treated to a dazzling six-planet "alignment" this January.

Starting up again Saturday, a sweeping view of our solar system will glow in the night sky. The planetary alignment, or a ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

In the depth of winter, a sweeping view of our solar system will glow in the night sky. In total six planets will be visible, ...

A shortcut for New Yorkers to spot some of the planets is to look for them when they are near the moon. On Feb. 1, Venus will appear just above the crescent moon. On the third day of the month, ...