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In a stunning new development, NASA scientists have confirmed that the Curiosity rover has discovered the largest organic molecules ever found on the Martian surface. The groundbreaking analysis of an existing rock sample, “Cumberland,” within Curiosity’s onboard lab revealed the presence of decane, undecane, and dodecane – compounds with 10, 11, and 12 carbon atoms respectively.
These molecules are believed to be fragments of preserved fatty acids, key building blocks of life as we know it on Earth. While non-biological origins are possible, the size of these newly detected molecules significantly boosts the potential for the preservation of complex biosignatures on the red planet.
This discovery builds upon years of tantalizing findings by Curiosity, including the detection of smaller organic molecules, organic salts, and the measurement of total organic carbon comparable to Earth’s most extreme environments. The new data suggests that larger, more complex organic compounds could have survived for billions of years despite harsh Martian conditions.
The network of cracks in this Martian rock slab called “Old Soaker” may have formed from the drying of a mud layer more than 3 billion years ago. The view spans about 3 feet (90 centimeters) left-to-right and combines three images taken by the MAHLI camera on the arm of NASA’s Curiosity Mars rover.
Credits: NASA/JPL-Caltech/MSSS
Lead author Caroline Freissinet emphasized the significance, stating, “Our study proves that, even today, by analyzing Mars samples, we could detect chemical signatures of past life—if it ever existed on Mars.”
Scientists are particularly intrigued by the carbon chain length of the presumed fatty acids (11-13 carbons), as non-biological processes typically yield shorter chains. This raises the exciting possibility of longer-chain fatty acids, often associated with biological activity, being present.
While the exact origin of these molecules remains under investigation, this major breakthrough reinforces the critical need for Mars Sample Return missions to conduct in-depth analysis with advanced Earth-based instruments.
“We are ready to take the next big step and bring Mars samples home to our labs to settle the debate about life on Mars,” declared Dr. Daniel Glavin.
This latest discovery marks a significant leap in our understanding of Martian organic chemistry and further fuels the compelling narrative that Mars may have once harbored the conditions necessary for life. The search for evidence of past life on the red planet has just intensified.
