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

NASA has been monitoring a never-before-seen planet in its solar system, which is eight times the size of Earth. The ...

THE search for alien life across our Solar System and beyond has so far kicked up nothing intelligent – let alone microbial.

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

Learn about the new perspective on Earth's reduction of moderately volatile elements, a discovery made possible by meteorites ...

Mercury takes only 88 Earth days to orbit the sun.

Astronomers discovered the gas giant planet — dubbed a "hot Jupiter " — in 2016, but have continued to investigate this ...

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

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

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 ...

Our Solar System is a carefully balanced celestial dance held together by a virtually perfect balance of gravity and inertia.