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

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but get a telescope and you can spot Neptune and Uranus.

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

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

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

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

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

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

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

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

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...

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