Structures resembling spiderwebs, only much larger, have been discovered on Mars by the Curiosity rover, suggesting a more extensive history of water on the Red Planet than previously understood.
Pasadena – For years, Mars has been characterized as a dry, inhospitable planet. However, new discoveries from the NASA’s Curiosity rover are challenging that view. The rover has been exploring a region displaying striking geological formations, dubbed “boxwork,” that stretch for kilometers and rise up to two meters high. These formations, characterized by intricate ridges and sand-filled depressions, are reshaping our understanding of the planet’s past. This discovery underscores the importance of robotic exploration in uncovering the secrets of our solar system.
For approximately six months, the rover has been investigating this unusual Martian landscape and its impressive geological structures. On Earth, similar boxwork formations are typically slight, found in caves or arid deserts, rarely exceeding a few centimeters in size. The presence of these structures on Mars, at such a monumental scale, has surprised and excited researchers.
Mars Formation Under Investigation by NASA Rover – Evidence of Past Water?
Scientists theorize that groundwater once permeated cracks in the rock, leaving behind mineral deposits. These minerals solidified the surrounding rock, forming resilient ridges. As Martian winds eroded softer materials and created depressions, the harder, mineralized areas remained as elevated structures. Curiosity’s high-resolution close-up images and detailed on-site analyses have allowed researchers to thoroughly investigate this hypothesis for the first time.
Surprise on Mars: “The groundwater level must have been quite high”
The location of these formations on Mount Sharp – a five-kilometer-high Martian mountain whose layers document different climatic epochs like a geological archive – provides important new insights. The boxwork structures are located at an altitude where, according to previous assumptions, there should have been hardly any water.
“Seeing boxwork so high up on the mountain suggests that the groundwater level must have been quite high,” explains mission scientist Tina Seeger from Rice University. “And that means that the water necessary for life could have been present for much longer than we thought from orbit.”
Exploring the Martian Region is Difficult for the NASA Rover
Navigating this terrain presented significant challenges for the rover’s control team. The SUV-sized rover had to maneuver over narrow ridges and navigate through treacherous sand dunes. “It almost feels like a highway People can drive on. But then we have to go down into the depressions, where you have to be careful that Curiosity’s wheels don’t spin or receive stuck in the sand,” describes engineer Ashley Stroupe from the Jet Propulsion Laboratory.
Field research confirmed that the dark lines visible in satellite images are indeed central fracture zones through which groundwater once seeped. Unexpectedly, Curiosity too discovered nodular structures – called Nodules – that do not occur directly on the fracture zones, but on the side walls of the ridges and in the depressions. “We can’t quite explain why the nodules appear where they do yet,” Seeger admits. This observation suggests more complex geological processes than initially assumed.
NASA Rover Curiosity Also Searched for Organic Material on Mars
The research team conducted extensive investigations, analyzing four rock samples using X-ray technology and a high-temperature furnace. One particularly promising sample was even subjected to a special wet-chemical process – a method used to identify organic compounds. These carbon-based molecules are considered fundamental building blocks for the emergence of life. Whether this detection of organic substances was successful, NASA has not yet announced. The results, however, could have far-reaching implications for the search for traces of past life on Mars.
In March, Curiosity will leave the fascinating spiderweb region and continue its exploration of the sulfate-rich layers of Mount Sharp. The overarching mission remains unchanged: to gain a better understanding of how the Martian climate evolved billions of years ago – and how long the conditions may have favored the emergence and preservation of life. (Source: NASA) (tab)
