Mercury takes only 88 Earth days to orbit the sun.

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

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 ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

Feb. 28: Seven planets – Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune. (The last time all seven planets aligned ...

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 ...

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 ...

Six planets will be visible to the naked eye and eight can be seen if you have a telescope or binoculars. The celestial event is called a planetary parade. The planetary parade is a celestial ...

Known as the "Parade of Planets," the celestial event will feature appearances from Mars, Jupiter, Uranus, Venus, Neptune and Saturn through the end of January, according to Farmer's Almanac. Mercury ...