Earth's atmosphere is also incredibly corrosive for things made out of wrong metals. Steam everywhere in places even in the form of vapor or liquid mixed with s

Earth's atmosphere is also incredibly corrosive for things made out of wrong metals. Steam everywhere in places even in the form of vapor or liquid mixed with salt (even more corrosive). EDIT: oh and there is oxygen everywhere, if your spacecraft doesn't corrode it will burn. And even if it lands 2/3 of this planet are covered with 4km deep oceans of the corrosive stuff!