The eye of Sahara, a geological formation that was first photographed by Gemini astronauts in the 1960s, has been a mysterious phenomenon for decades. A similar structure has now been seen on Mars, where a 30 km-wide unnamed crater has been seen in the Aonia Terra region. Resembling veins running through a human eyeball, these channels are likely to have carried liquid water across the surface of the red planet around 3.5-4 billion years ago. According to ESA, the channels look as if they are partly filled with a dark material, and in some places, seem to actually be raised above the surrounding land.
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