NASA’s Curiosity rover has discovered a surprising variety of organic molecules on Mars, including chemicals that scientists consider important building blocks for life on Earth.
The finding comes from a new type of chemical experiment that has never before been carried out on another planet.
The results suggest that the Martian surface can preserve complex organic materials for billions of years.
This is important because such materials could, in theory, be linked to ancient life.
However, scientists are careful to point out that these molecules do not prove life ever existed on Mars. Organic compounds can also form through natural geological processes or arrive on the planet through meteorites.
The study was led by Amy Williams, a geologist at the University of Florida who works with both the Curiosity rover and NASA’s newer Perseverance rover. The findings were published in the journal Nature Communications.
Curiosity landed on Mars in 2012 to explore whether the planet once had conditions suitable for tiny living organisms.
It has been studying rocks and soil in Gale Crater, an ancient lakebed that once held water billions of years ago. Water is considered essential for life, so this area is a key place to search for clues.
In this latest experiment, the rover analyzed rock samples collected in a region called Glen Torridon, which is rich in clay minerals. These clays are especially good at preserving organic material over long periods.
Scientists believe the molecules found in these samples may be around 3.5 billion years old.
Using an onboard laboratory called the Sample Analysis at Mars (SAM), the rover performed a special test using a chemical reagent to break larger molecules into smaller parts. This made it easier to identify their structure.
Among more than 20 different compounds detected, researchers found a nitrogen-containing molecule that resembles chemicals used to build DNA. This type of molecule has never been seen on Mars before.
The rover also detected benzothiophene, a complex sulfur-containing compound that is often delivered to planets by meteorites. Scientists think that similar materials may have helped provide the ingredients for life on early Earth.
Although the discovery is exciting, confirming whether life once existed on Mars will require more detailed study. Scientists say the best way to answer that question is to bring Martian rock samples back to Earth, where they can be analyzed with more advanced equipment.
Still, this finding is an important step forward. It shows that Mars can preserve complex organic chemistry, increasing the chances that future missions may uncover stronger evidence about the planet’s past and its potential to have supported life.
Source: KSR.
