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"
Mt. Etna Lava Plumes
31/03/2003
Mt. Etna has been erupting for hundreds of thousands of years. Located in Sicily, Italy, the volcano produces lava fountains over one kilometer high. Mt. Etna is not only one of the most active volcanoes on Earth, it is one of the largest, measuring over 50 kilometers at its base and rising nearly 3 kilometers high. Pictured in 2001 May, the tops of two lava plumes are visible near the center of the frame, while hot lava flowing down the volcano is visible on the left. This panoramic shot also includes the city lights of Calabria and Taormina on the left, and Catania on the right. The Earth's rotation is discernable on this long duration image as star trails. Orange Mars can be seen rising just below the star Antares far in the distance.