Perseverance Studies Organic Carbon in Martian Rocks
NASA’s Perseverance rover has taken a closer look at organic carbon found in rocks on Mars. The discovery is helping scientists better understand whether the planet may have once had conditions suitable for life.
Organic carbon is important because it forms the molecular backbone of all known living organisms. It is linked to the chemistry behind DNA, cells, and proteins. However, scientists say its presence on Mars does not prove that life once existed there.
The latest research focused on organic carbon found in sedimentary rock inside Jezero Crater. Scientists believe the mudstone formed between 3.2 and 3.8 billion years ago under an ancient body of water that has now disappeared.
Rocks May Hold Signs of a Habitable Past
The organic carbon was detected in two rocks named Cheyava Falls and Walhalla Glades. These rocks were sampled by Perseverance at locations about 100 meters apart. Last year, NASA said one of the rocks contained a possible biosignature.
Cheyava Falls attracted major attention because of its unusual appearance. NASA images showed a rusty-red mudstone with ring-shaped features that looked like leopard spots. It also had dark marks that appeared similar to poppy seeds.
On Earth, such features can sometimes be linked to microbial activity. But scientists say more research is needed before making any conclusion. A potential biosignature is not proof of life. It only means a feature may have a biological origin and requires further testing.
Scientists Say More Testing Is Needed
Using Perseverance’s SHERLOC instrument, researchers studied a complex form of carbon known as macromolecular carbon. They found that the carbon in the Martian rocks has similarities with carbon formed through both biological and non-biological processes on Earth.
It also resembles carbon formed through non-biological processes found in meteorites. This means scientists still cannot say whether the carbon came from ancient microbes or from chemical reactions between rock and water.
Researchers said this is the first discovery of macromolecular carbon in mudstones at Jezero Crater. NASA’s Curiosity rover had earlier found similar carbon at Gale Crater, located about 3,700 kilometers away.
Scientists said the findings suggest organic materials may have been widespread on ancient Mars. They also strengthen evidence that Mars once had chemical ingredients and environmental conditions that could have supported life.
However, the rover’s instruments cannot determine whether the carbon was produced by life. Scientists say the samples must be returned to Earth for advanced laboratory testing.
Mars is now cold, dry, and harsh. But billions of years ago, it likely had a thicker atmosphere, a warmer climate, and liquid water on its surface. Jezero Crater was once home to an ancient lake system, making it one of the most important sites in the search for past life.
Researchers say if life is ever confirmed on Mars, it would be one of the most important discoveries in human history. It would suggest that life may not be limited to Earth when the right conditions and ingredients are present.
