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 ...

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

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

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

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

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 ...

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 ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

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

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 ...