#PPOD: In this image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter, the dark branched features in the floor of Antoniadi Crater look like giant ferns, or fern casts. However, these ferns would be several miles in size and composed of rough, rocky material. Credit: NASA/JPL-Caltech/University of Arizona

Learn more: https://science.nasa.gov/resource/branched-features-on-the-floor-of-antoniadi-crater/

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