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No signature of clear CO₂ ice from the `cryptic' regions in Mars' south seasonal polar cap

Forget, F.; Bibring, Jean-Pierre; Langevin, Yves +5 more

The seasonal polar ice caps of Mars are composed mainly of CO₂ ice. A region of low (< 30%) albedo has been observed within the south seasonal cap during early to mid-spring. The low temperature of this `cryptic region' has been attributed to a clear slab of nearly pure CO₂ ice, with the low albedo resulting from absorptio…

MARSIS radar sounder evidence of buried basins in the northern lowlands of Mars

Stofan, Ellen R.; Clifford, Stephen M.; Safaeinili, Ali +7 more

A hemispheric dichotomy on Mars is marked by the sharp contrast between the sparsely cratered northern lowland plains and the heavily cratered southern highlands. Mechanisms proposed to remove ancient crust or form younger lowland crust include one or more giant impacts, subcrustal transport by mantle convection, the generation of thinner crust by…