Updated

Updated · EarthSky · Aug 27

Curiosity Rover's 2023 Mars Image Goes Viral as 15-Pixel 'Jellyfish' Likely Proves Artifact

Updated

Updated · EarthSky · Aug 27

Curiosity Rover's 2023 Mars Image Goes Viral as 15-Pixel 'Jellyfish' Likely Proves Artifact

Q: Why did a mysterious jellyfish-like shape on Mars vanish from Curiosity’s cameras just minutes after being photographed?

It most likely vanished because it was never a real, persistent object on Mars at all, but a one-frame camera artifact or other brief imaging anomaly. The evidence is the timing. Curiosity’s right navigation camera captured the jellyfish-like shape in a single low-resolution grayscale image on Aug. 20, 2023, but images taken in the same direction less than two minutes earlier showed nothing there, and another image from the same camera about 78 minutes later also showed nothing. A genuine rock, structure or organism on the landscape would not be expected to appear in only one frame and then disappear so completely. Researchers say the leading explanation is a cosmic-ray strike on the camera sensor. Mars has a much harsher radiation environment than Earth, and high-energy particles regularly hit rover detectors, creating odd bright or dark marks in individual images. That would fit the shape’s tiny size — about 15 pixels — and its one-off appearance. Other non-exotic explanations remain possible, including an electronic readout problem, a transmission or processing glitch, or a brief dust-related event. But there is no supporting evidence from other cameras or wind data to back a dust explanation. Because the feature appears only once and in such low resolution, scientists cannot prove exactly what caused it. But its disappearance is precisely why experts think it originated in the imaging system, not on the Martian surface.

3 articles · Updated · EarthSky · Aug 27

A Curiosity rover photo taken on Aug. 20, 2023 in Gale crater has gone viral after an Aug. 12, 2026 X post highlighted a tiny dark shape resembling a jellyfish above a rocky hill.
Two timing clues point to an artifact: images shot less than 2 minutes earlier in the same direction showed nothing, and another right-navigation-camera image 78 minutes later showed the shape had vanished.
About 15 pixels wide in a raw grayscale frame, the feature is too small for firm identification; the leading explanations are a cosmic-ray strike on the CCD or an electronic, transmission or processing glitch.
A transient physical event such as dust or a dust devil cannot be ruled out, but missing wind-sensor data and no matching left-camera image leave the anomaly unresolved.
The episode underscores how single low-resolution rover images can spawn viral Mars mysteries even when the most likely answer is a camera or data artifact.