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 ...

Grab a pen and draw a figure. Follow a few rules: keep your lines straight, don’t pick up your pen, don’t cross the lines, and finish at the spot where you started. You’ll have a polygon. Polygons are ...

In our exploration of Mars, we’ve seen some strange but naturally occurring shapes. Polygons — a shape with at least three straight sides and angles, typically with five or more — have been seen in ...