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 ...

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

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

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 ...

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

You might want to keep your eyes on the skies through next month: Six planets will align in January and February.

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

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

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

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

Planetary alignments aren't rare, but they can be when they involve six of the eight planets in our solar system.