Martian polygons and deep-sea polygons on Earth: More evidence for ancient Martian oceans?

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Debate over the origin of large-scale polygons (hundreds of meters to kilometers in diameter) on Mars remains active even after several decades of detailed observations. Similarity in geometric patterns on Mars and Earth has long captured the imagination. Geologists have examined these large-scale polygons and compared them to similar features on Earth's seafloor, which they believe may have formed via similar processes....
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