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 ...

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

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

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

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

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 ...

HELENA — The planets are aligned. Six planets, Mars, Jupiter, Uranus, Neptune, Venus and Saturn can be seen in the night sky.

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

Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

is when several planets in our solar system appear to line up in the sky from our perspective here on Earth." The planet parade occurs when the planets' positions in their elliptical orbit around ...