Portal:Solar System/Did you know/15


 * ... that troilite, a form of pyrrhotite, is extremely rare on Earth but is abundant on Mars (pictured)?


 * ... that on the Mars Exploration Rover (artist's impression pictured), a technique known as visual odometry allowed the rover to estimate its position and orientation using only camera images?


 * ... that ejecta from the impact that created Zunil crater in Athabasca Valles on Mars is a possible source of Martian meteorites?