![]() These features are likely a result of seasonal changes in temperature that cause cycles of expansion and contraction of the ice-rich material, eventually leading to the development of fractures. One of the notable features in the crater deposits is the presence of quasi-circular and polygonal patterns of fractures. ![]() Just like on Earth, Mars’ tilt gives rises to seasons, but unlike Earth its tilt has changed dramatically over long periods of time. ![]() It is thought that these deposits were laid down during an earlier time in Mars’ history when the inclination of the planet’s spin axis allowed water-ice deposits to form at lower latitudes than it does today. The interior of the crater is filled with deposits that are probably water-ice rich. The image was taken by the CaSSIS camera onboard the ESA/Roscosmos ExoMars Trace Gas Orbiter (TGO) on 13 June 2021 in the vast northern plains of Acidalia Planitia, centred at 51.9°N/326.7☎. Tree rings provide snapshots of Earth’s past climate and, although formed in a very different way, the patterns inside this crater reveal details of the Red Planet’s history, too. ![]() It’s actually an impressive birds-eye view into an ice-rich impact crater on Mars. This feature could easily be mistaken for a tree stump with characteristic concentric rings. ![]()
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