It is the forth planet from the Sun, often called the "Red Planet". In the pre-space age, Mars was the best candidate for hosting extra-terrestrial life.

Average distance from the Sun: 228 million km
Distance from Earth: Minimum 55.7 million km, Maximum 399 million km
Mass: 0.107 times the mass of Earth
Diameter: 6,794 km
Day duration: 24.6 earth hours
Year duration: 687 earth days
Temperature: Minimum -170ο Celsius, Maximum 17ο Celsius
Atmosphere: Carbon dioxide (95%), nitrogen, argon, krypton
Surface gravity: 0.377 times that of Earth (If on Earth you weigh 70kg, on Mar's surface you would weigh 27 kg)