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 ...

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

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 ...

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

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

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

Our Solar System is a carefully balanced celestial dance held together by a virtually perfect balance of gravity and inertia.

Although it's being mistakenly promoted as a "rare planetary alignment," one of the best "planet parades" in half a century ...

In the early evening, look to the southwest and you'll see Venus (the brightest object in the sky after the Sun and Moon) and ...