Mars
Mars is the fourth planet from the Sun and the seventh largest in the Solar System. A cold, dusty desert world with a thin atmosphere (mostly CO₂), the planet features extinct volcanoes, deep canyons, polar ice caps, and seasons. Mars has two small moons (Phobos and Deimos), a day just over 24 hours long, and a year lasting about 687 Earth days. It is a prime focus of robotic exploration and studies about past water and habitability.
Source: science.nasa.gov
APODs including "Mars"
Name This Martian Robot
26/11/2002
NASA will launch two robots to Mars next year and you can help name them. The Mars Exploration Rovers are scheduled for launch on or near this coming June, when Mars and Earth are relatively close in their orbits. The landing craft are expected to touch down on Mars in January 2004 and deploy the robot rovers shortly thereafter. Rovers have the capability to crawl about 100 meters each day of their planned 90-day mission. The mission's scientific purpose is to seek out and inspect interesting rocks and terrain that could give clues to the past of Mars. Suggestions for names should be sent here, accompanied by a short essay, by 2003 January 31. (Eds. Note: The contest is only open to school children in grades K-12.)