The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

February will be an awe-inspiring month for astronomy enthusiasts who will be able to the see the solar system's planets ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

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

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

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

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

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 ...

Sky watchers are in for a treat this month as the stars align to give amateurs a shot to see six planets at once.

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

This provides another piece of the puzzle to understand how planets and ... New studies offer a clearer picture of how the outer solar system formed and evolved based on analyses of trans ...