Mars

Its rust-red colour comes from oxidised iron in the dust covering its surface. Home to the tallest known volcano in the system, Olympus Mons, and a canyon, Valles Marineris, long enough to stretch across a good part of a continent. Its two moons, Phobos and Deimos, are likely captured asteroids.

Diameter	6,779 km
Average distance from Sun	227.9 million km
Local year	687 Earth days
Moons	2 (Phobos, Deimos)