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

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 ...

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.

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

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 ...