A City-Sized 'Eye' Has Been Discovered on Mars

 the image reveals some of the mysterious features of the unexplored and unnamed crater,

which stretches across a city-sized 18 miles of a region called Aonia Terra,

The formation is surrounded by ancient evidence of water flowing across the Martian surface in channels,

 these channels are likely to have carried liquid water across the surface of Mars around 3.5–4 billion years ago,”

“The channels appear to be partly filled with a dark material, and in some places,

The agency said that these strange features, which are still not understood

The crater is just one of many fascinating formations in Aonia Terra,

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