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

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

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

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

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

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

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show ...

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

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

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 ...

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

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 ...