Mars statistics

Diameter: 6,791 kilometres (4,220 miles)

Gravity: 38 per cent of Earth’s

Atmospheric composition: 95.32% carbon dioxide;

2.7% nitrogen; 1.6% argon; 0.13% oxygen; 0.08% carbon monoxide; traces of water, nitrogen oxide, neon, heavy water, krypton and xenon

Chemical composition:

Core: Iron, nickel and sulphur

Mantle: Peridotite (silicon, oxygen, iron and magnesium)

Crust: Volcanic rock basalt

Moons: Phobos and Deimos