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

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

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

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

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

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

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...

All of our solar system's planets are lining up to take part in a rare and awesome event in the night sky - this is when and ...

A rare celestial event where seven planets align is visible in the UK skies. Discover how, when, and where you can observe ...

Planetary alignments aren't rare, but they can be when they involve six of the eight planets in our solar system. Look for a planetary parade that includes Mars, Jupiter, Uranus, Neptune ...