This graph compares the elemental composition of typical soils at three landing regions on Mars: Gusev Crater, from Spirit; Meridiani Planum, from Opportunity; and now Gale Crater, where NASA newest Curiosity rover is currently investigating.
This graph compares the elemental composition of typical soils at three landing regions on Mars: Gusev Crater, from Spirit; Meridiani Planum, from Opportunity; and now Gale Crater, where NASA newest Curiosity rover is currently investigating.