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

Mercury takes only 88 Earth days to orbit the sun.

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

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

Open the Youtube video But will all eight planets (sorry Pluto) ever align all together in the sky?Well, that depends on your perspective. First off, it's actually pretty rare for planets to align ...

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

While planets circle the sun in what's called and heliocentric orbit, they rarely fall together in what appears to the human eye as somewhat of line across the visible horizon. Saturday is one of ...

This extraordinary celestial event will see the sky scattered with seven visible planets in what is known as a great planetary alignment. The eight planets in our solar system orbit the sun in ...

Known as the "Parade of Planets," the celestial event will feature appearances from Mars, Jupiter, Uranus, Venus, Neptune and ...

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 ...