Lava tubes on Earth have been studied for signs of ancient microbial life, providing a model for searching for life in similar structures on Mars. A comprehensive study of lava tubes—caves formed by c ...
The sulfur Curiosity found on Mars. (NASA/JPL-Caltech/MSSS) Sulfates are salts that form when sulfur, usually in compound form, mixes with other minerals in water. When the water evaporates, the ...