Layering history shows how water and carbon dioxide have moved across Mars
Mars' south polar layered deposits of H2O and CO2 ice record its climate history. A new study links the long-term global movement of Mars' water from midlatitude to pole to a function of the planet's orbital configuration with H2O ice deposition decreasing as a factor of obliquity, or spin-axis tilt. "No deposit yet analyzed provides a global water cycle record that can be tied to a specif