Mercury is the closest planet to the sun, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury orbits ...

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

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

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

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...

While planets circle the sun in what's called and heliocentric orbit, they rarely fall together in what appears to the human ...

A planetary alignment, or a "planet parade" according to the internet, will grace our night sky just after dusk, according to ...

There are eight planets in the solar system, and each travels on its own path around the sun. But of these planets, which is nearest to the sun? Mercury is a strange little world. There are some ...