A Rover on Mars Discovers Organic Molecules, Hinting at the Possibility of Ancient Life

NASA's Curiosity rover has discovered previously undetected organic molecules on Mars, suggesting that a form of life may have existed on the red planet in the past. After several years of laboratory analysis, a rock drilled and studied by the rover in 2020 has been confirmed to contain organic molecules.

Among these is a nitrogen heterocycle. Its molecular structure, a ring of carbon atoms including nitrogen, is considered a precursor to RNA and DNA. However, scientists have no way of knowing whether these molecules originated from biological or geological processes, as both scenarios remain plausible, the agency noted.

Nonetheless, this discovery strengthens the idea that Mars once had the necessary chemical conditions to support life. This announcement comes shortly after the success of the Artemis II mission, during which four astronauts ventured further from Earth than any humans before.

"This set of organic molecules once again reinforces the possibility that Mars may have hosted life in the distant past," stated project scientist Ashwin Vasavada. "Curiosity and our team have performed spectacularly. It took dozens of scientists and engineers to locate this site, drill the sample, and make these discoveries with our incredible robot."

The rock sample, nicknamed Mary Anning 3 in honor of an English paleontologist, was found in a section of Mount Sharp, an area that was covered with lakes and rivers billions of years ago. The detection of DNA precursors is "particularly significant, as these structures could be chemical precursors to more complex nitrogenous molecules," explained lead study author Amy Williams from the University of Florida in Gainesville.

"Nitrogen heterocycles had never been observed before on the surface of Mars nor confirmed in Martian meteorites." Researchers also identified benzothiophene, which had been previously detected in meteorites. These meteorites, along with the organic molecules they contain, are considered by some scientists to have contributed to seeding prebiotic chemistry in the early solar system.

Source: Sky News