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A NASA rover just exposed something on Mars that eluded orbiters

22 April 2025
in Tech
Reading Time: 4 mins read
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A NASA rover just exposed something on Mars that eluded orbiters
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A NASA rover taking rock samples on Mars has uncovered a plentiful mineral that was invisible to orbiters studying the Red Planet from space.

Scientists say the discovery of siderite, a type of iron carbonate, could be crucial evidence to support the theory that Mars once had a thick carbon dioxide-rich atmosphere, allowing a warm enough environment to support oceans, lakes, and streams.  

Curiosity, a car-sized lab on six wheels, performed a chemical analysis of four rock samples drilled at different elevations of Mount Sharp, a mountain it has been exploring within Gale Crater. Three of the samples showed considerable amounts of siderite. Another sample, which had no significant traces of siderite, contained other iron-rich minerals that can form as siderite breaks down. 

This iron carbonate mineral is known to form on Earth under specific chemical conditions involving water, iron, and carbon dioxide. The study, published in the journal Science, suggests more carbon is stored in the Martian crust than previously thought. And if similar carbonates exist in other sulfate-rich regions, they could represent a hidden trove of Mars’ ancient atmosphere.

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