Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a ...

Aside from Earth, no planet in the solar system captures our imagination quite like Mars. The Red Planet is one of the few ...

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

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

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

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

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

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

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

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

In the depth of winter, a sweeping view of our solar system will glow in the night sky. In total six planets will be visible, ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...