Mars is the fourth planet from the Sun (Earth is the third), and is well-known as a setting for science-fiction stories.

Space missions to Mars have so far all been automated due to the difficulties of sending humans to the red planet. The Viking landers of 1976 and 1980 were among the first to search for life, and the Pathfinder mission of 1997 began the use of remote-controlled rovers, currently embodied in the Mars Exploration Rovers Spirit and Opportunity, who landed in 2004 and continue their explorations today. One of the main themes of their current mission has been the search for evidence of past or present flowing water on Mars, and this search has been boosted by images from the Mars Global Surveyor and Mars Express missions.

The geography of Mars (sometimes known as areography) includes the spectacular highlights of Olympus Mons, the largest volcano in the Solar System, and the Valles Marineris, a network of canyons which dwarves the Grand Canyon on Earth. The Hellas Planitia impact basin dominates the topography of Mars' southern hemisphere, and prominent ice-caps are visible at both north and south poles. Mars has two moons, Phobos and Deimos.

The depiction of Mars in mythology and popular culture has led to its name being borrowed frequently, notably in the confectionery bar and company of the same name. Here is a selection of E2 nodes related to Mars in one way or another:

Geography (Areography)
Face on Mars
Hellas Planitia
Olympus Mons
Valles Marineris

Mars Climate Orbiter
Mars Direct
Mars Exploration Rovers
Mars Global Surveyor
Mars Polar Lander

Escape Velocity
James Cameron Mars speech
Living on Mars
Mars in Retrograde
Mars is barren
Mars Society
quick terraformation of Mars
The Life on Mars Problem
there's water on Mars!

Battered Mars Bar
deep fried Mars bar
Mars Bar
Mars Bar party
Mars Bar Slice
Mars, Incorporated
The Mattel and Mars Bar Quick Energy Chocobot Hour
The perfect way to eat a Mars Bar on a sunny day

2001 Mars Odyssey
A Princess of Mars
Alan Mendelsohn, the Boy from Mars
Chessmen of Mars
David Starr, Space Ranger
Devil Girl from Mars
Distance on Mars
Ghosts of Mars
Green Mars
Invaders From Mars
John Carter
Kent Montana and the Really Ugly Thing From Mars
Lobster Men From Mars
Mars Attacks!
Mars Trilogy
Mission to Mars
Moving Mars
My lunch money was stolen by a predatory Mars rover
Podkayne of Mars
Racing Mars
Red Mars
Sailor Mars
The Far Call
The Martian Chronicles
The Road To Mars
The Wizard of Mars
Warlord of Mars

30 Seconds to Mars
Attack From Mars
From The Mars Hotel
Genius from Mars Technique
Girl from Mars
How to go to Mars as an Astronaut
Life On Mars?
Mars Blackmon
Mars' Cheese Castle
Mars Landing Party
Mars Lights
Mars Matrix
Mars Resistance
The Mars Volta
Melodies from Mars
Men Are From Mars, Women Are From Venus
Monuments of Mars
My lunch money was stolen by a predatory Mars rover
Planetary Linguistics
3rd Rock from the Sun
The Laziest Men on Mars
The Rise and Fall of Ziggy Stardust and the Spiders from Mars
Why digital media will get man to Mars