NASA’s Curiosity rover has identified more than 20 types of organic molecules in 3.5-billion-year-old rock samples from Mars’ Glen Torridon region, including nitrogen-containing compounds resembling proto-DNA components.
How the detection was made possible
The discovery relied on Curiosity’s Sample Analysis at Mars (SAM) instrument conducting a wet chemistry experiment using tetramethylammonium hydroxide (TMAH) reagent. This method liberated organic fragments tightly bound to minerals or embedded in large macromolecular structures by heating samples to approximately 550 degrees Celsius.
Why Glen Torridon was targeted
Scientists selected the Glen Torridon area within Gale Crater based on strong evidence that water existed there billions of years ago, creating conditions favorable for life’s emergence, as noted in research published in Nature Communications.
What the findings suggest about Mars and Earth
The detection of benzothiophene—a sulfur compound commonly found in meteorites—underscores similarities between early processes on Earth and Mars. Geologist Emma Williams noted that materials delivered to Mars via meteorites were likely the same building blocks that sparked life on Earth.
What makes these organic molecules significant?
The nitrogen-containing compounds identified have structures resembling components of proto-DNA, suggesting potential prebiotic chemistry.
How old are the rock samples analyzed?
The samples analyzed by Curiosity are approximately 3.5 billion years old.