From time to time, Mars rovers and orbiting spacecraft send back striking images of unusual rock formations on the Red Planet. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

These discoveries range from the curious—like a donut-shaped rock that might not even originate from Mars—to the playful, such as the so-called avocado rock or a pile of stones jokingly dubbed ‘ bones .’ Recently, attention turned to a newly spotted "square structure" photographed by the Mars Global Surveyor’s Orbiter Camera (MOC). After gaining traction on Reddit’s ‘aliens’ subreddit , the image drew far wider attention once Joe Rogan and Elon Musk began sharing it on X.

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