NASA's Curiosity rover has discovered new compelling evidence of Mars' soggy past. The rover has documented patches of well-preserved ancient mud cracks, indicating that Mars witnessed periodic wet-dry cycles about 3.6 billion years ago.
. These patterns have never been observed before on the Martian surface.
The data beamed back revealed the red planet's buried ancient past. The drill samples uncovered a transitional zone between two soil layers under Mars's surface. “The minerals prevalent in each area reflect different eras in Gale Crater’s history. The transitional zone between them offers a record of a period when long dry spells became prevalent and the lakes and rivers that once filled the crater began to recede,” explained NASA.
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