Sol 1373: The Strange Geometric Rock on Mars

On 16 June 2016, NASA's Curiosity rover was travelling across Gale Crater on Mars when it photographed something that would later attract considerable attention online.

Among the ordinary Martian rocks and weathered terrain was a small object with an unusually sharp, angular profile. To some observers, it looks remarkably like a miniature pyramid.

The photograph was taken during Sol 1373 of Curiosity's mission — the 1,373rd Martian day since the rover landed on Mars in August 2012. NASA's archive contains multiple Mastcam images from that sol, including photographs taken on 16 and 17 June 2016.

But what exactly are we looking at?

A surprisingly geometric shape. The object is interesting because of its apparent geometry.

Rather than having the irregular appearance normally associated with a heavily weathered rock, the visible portion has a pointed, wedge-like outline.

In the right conditions, the human brain is exceptionally good at recognising familiar shapes. A triangular rock can therefore immediately suggest a pyramid, structure or manufactured object.

But appearance alone cannot establish what produced the shape.

The crucial question is whether the geometry remains convincing when the image is examined in its wider context.

Where was Curiosity?

At this stage of the mission, Curiosity was exploring the lower slopes of Mount Sharp, inside Gale Crater.

The rover had been examining exposed bedrock and geological formations created during Mars' ancient environmental history.

NASA's mission notes from Sol 1373 describe Curiosity travelling south through rugged terrain. The rover was examining exposed bedrock belonging to the Stimson Formation, while also taking remote observations with its Mastcam and ChemCam instruments.

The Sol 1373 drive subsequently moved Curiosity approximately 31 metres south. NASA reported that there was abundant exposed bedrock around the rover but not a sufficiently flat area within the arm's workspace for brushing the rock surface.

This is important because the surrounding landscape wasn't an unexplored flat plain. Curiosity was operating in a highly eroded geological environment containing layers, fractures, ridges and angular pieces of bedrock.

Could geology produce a shape like this?

Absolutely. Mars has no shortage of rocks with unusual shapes.

Wind erosion, fracturing, sedimentary layering and differences in the hardness of minerals can gradually remove some parts of a rock while leaving other sections standing.

The result can be surprisingly sharp edges, slabs, wedges and points.

Earth also provides plenty of examples of naturally occurring rocks that look almost manufactured when photographed from a particular angle.

Mars can produce the same effect.

In fact, the surrounding terrain explored by Curiosity contains extensive evidence of erosion and ancient sedimentary processes.

So a geometric appearance by itself isn't evidence of artificial construction.

But that doesn't make the photograph uninteresting.

There is a tendency for unusual Mars photographs to fall into two extremes.

One side immediately declares that an object must be artificial. The other dismisses the observation entirely because a natural explanation is possible.

Neither approach is particularly useful.

The interesting question is: How much information can we actually extract from the image?

We can establish that Curiosity really did photograph an object with an unusual angular appearance. We can establish when and where the image was taken. We can examine the surrounding terrain.

We can compare the object with other rocks in the same geological environment. And we can ask whether the apparent symmetry survives closer examination.

Those are much more useful questions than simply asking whether something "looks like a pyramid."

Perspective changes everything

One of the biggest problems with interpreting isolated objects on Mars is the absence of familiar scale. A photograph provides a two-dimensional representation of a three-dimensional landscape.

Without knowing the object's exact distance from the camera, its dimensions can be difficult to judge.

A rock several metres away can look similar in an image to a much larger formation farther away.

Shadows can also exaggerate edges. A sloping surface can appear vertical and a fracture can look like a deliberate cut. Two separate rocks can appear connected when viewed from a particular angle.

This is why multiple images from different positions would be extremely valuable.

If an object maintains the same apparent geometry from different viewing angles, confidence in its three-dimensional shape increases. If the apparent geometry disappears when the perspective changes, the original impression may have been largely an optical effect.

Did NASA call it a pyramid?

No. NASA's Sol 1373 documentation does not identify the object as a pyramid or artificial structure.

The official mission documentation instead describes Curiosity's activities in terms of geological observations, including investigations of Stimson Formation bedrock and surrounding terrain.

That distinction matters. There is a real NASA photograph. There is a genuinely unusual-looking object in the imagery. But there is currently no scientific evidence establishing that the object was manufactured.

The bigger Mars mystery

Perhaps the more interesting story isn't whether this particular rock is artificial. It is what Mars tells us about the enormous changes that occurred on the planet.

Curiosity has found extensive evidence that ancient Mars once had environments capable of supporting liquid water. The rover has studied sedimentary rocks, ancient lake deposits and minerals that formed under very different conditions from those found on the planet today.

By Sol 1373, Curiosity had already spent years documenting evidence of this lost Martian environment.

The apparently simple rock in the photograph is therefore sitting inside a landscape that records billions of years of geological history.

A tiny object with a big question attached

The Sol 1373 image demonstrates why Mars continues to fascinate people. The object is small. The image is only one view.

Its apparent geometry can have natural explanations. Yet it is unusual enough to make us stop and look twice.

That is where genuine investigation begins.

Rather than declaring: "It's a pyramid" or "It's definitely just a rock" the more scientifically useful position is: "This is an unusual-looking object. What can the available evidence actually tell us about it?"

Until additional observations establish otherwise, the safest interpretation is that the object is a naturally occurring Martian rock shaped by geological processes.

But the photograph remains an intriguing example of how strange the Martian landscape can look — and how much there is still to understand about the world next door.

The Evidence

Mission: NASA Mars Science Laboratory / Curiosity

Sol: 1373

Earth date: 16–17 June 2016

Location: Gale Crater, Mars

Camera: Mastcam, with additional Sol 1373 imagery from Curiosity's other cameras

Estimated height: roughly 10–20 cm (4–8 inches), although the exact dimensions cannot be established confidently from the single Mastcam image.

Official interpretation: Geological terrain and bedrock; NASA has not identified the object as an artificial structure.

The unanswered question: Is the object's striking geometry simply the result of Martian erosion, layering and perspective — or does further imagery reveal something more unusual?

For now, the photograph provides an interesting mystery, but not evidence of any ancient Martian construction.

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