Scientists have uncovered strong new evidence that water once existed on Mars, after discovering a buried ancient river delta deep beneath the planet’s surface. The finding, made by NASA’s Perseverance rover, could significantly improve the chances of detecting signs of ancient life on the Red Planet.
The delta was located more than 35 meters below the surface of Jezero Crater using advanced ground-penetrating radar. Perseverance, which landed on Mars in February 2021, has been exploring this crater due to its geological features that suggest it once contained water. The area, formed nearly 4 billion years ago by an asteroid impact, is believed to have once hosted conditions suitable for life.
Researchers focused on a region known as the Margin Unit, which contains carbonate minerals typically formed in water-rich environments such as lakes or shallow seas on Earth. This made the site a prime target for studying Mars’ ancient climate and potential habitability.
Using the rover’s RIMFAX radar instrument, scientists were able to scan deeper than previous missions and map underground structures in detail. By combining radar data with satellite imagery and navigation data, researchers created a 3D model of the subsurface layers.
The analysis revealed sloped sediment layers known as clinoforms, which are characteristic of river deltas. These formations occur when flowing water carries sand and mud into a larger body of water. Scientists estimate that this buried delta formed between 3.7 and 4.2 billion years ago, making it older than visible surface features in the same region.
This discovery suggests that Mars may have had flowing water much earlier than previously believed. It also indicates that the conditions suitable for life may have existed for a longer period in the planet’s history.
Overall, the presence of an ancient, hidden delta strengthens the case for past habitability on Mars and provides a promising new target for future exploration aimed at uncovering signs of ancient microbial life.
