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. 2021 Feb 3;7(6):eabe4459. doi: 10.1126/sciadv.abe4459

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — (A) Seasonal frost coating over ice at a scarp southeast of Hellas Planitia in early spring (5) from HiRISE image ESP_047338_1230 (56.6°S, 114.1°E). Image credit: NASA/JPL/University of Arizona. (B) View of (A) with an enhanced color stretch to emphasize the ice (blue shading). Image credit: NASA/JPL/University of Arizona. (C) Sediment core from the southern margin of Don Juan Pond, Wright Valley, Antarctica. Photo credit: Everett K. Gibson, NASA-JSC. (D and E) View of reddish, altered material below surface pebbles at soil pits on the southern margin of Don Juan Pond. Note the light-toned layers that are ~1 cm thick (cyan arrows) a few centimeters below the surface and occasionally also at deeper horizons. Photo credit: Everett K. Gibson, NASA-JSC.