Scientists have speculated that the channels and valleys of the Martian surface were carved by flowing water during the planet’s “wet and warm” years. In a study recently published
in the Journal of Geophysical Research – Planets
, however, researchers say that the water needed to carve these features may have accumulated as snow and ice first. Geologist Laura Kerber, a co-author on the study, describes how the Red Planet's geology presents a case for a “cold and icy” ancient climate on Mars.