Geology of Mars Mars is the planet that is the closest geologically to our own. Still we know little about the planet. All the information that we have is from what we see. We can speculate about the geology of the planet but we will never know for sure what the planet is really made of until we physicallygo there. The information is all from NASA sites or NASA related sites. Mars’ red color leads us to believe that the planet has large amounts of iron. This red color is the only color that is on the surface besides the poles. There is also a darker area that runs along the equator. It goes a