Introduction To The Search For Life On Mars
Nasa scientists are studying rocks in the Scottish Highlands to help them understand if there was once life on Mars. The US space agency announced last year that its Perseverance rover had found potential biosignatures, markings on rocks possibly made by ancient microbes. This summer, scientists took samples from a geological feature called the Stoer Formation, around Clachtoll, in Assynt, in the north-west Highlands.
Geological Similarities Between Earth And Mars
The area's rocks formed in environments comparable to ancient Martian lakes and rivers, but could also hold evidence of microbial life from 1.2 billion years ago. Clachtoll is a small crofting community on the Sutherland coast about 100 miles north of Inverness, and is a popular destination along the North Coast 500 tourist route.
Nasa's Goddard Instrument Field Team, which specialises in studying Earth's extreme environments, led the research expedition. Experts from the universities of Glasgow and Cambridge were among those involved. They took rock samples from cliffs for further analysis.
Understanding The Potential For Biosignatures On Mars
Nasa said: "Though Mars is dry today, the Martian landscape, like our own planet's, is shaped by an ancient history of flowing water. Both worlds have layered areas of mudstones and siltstones rich in clay minerals. Learning how signs of ancient life show up in Earth rocks like these Scottish cliffs can help us understand the story of habitability and the potential for biosignatures to be preserved and detected on Mars."
The rocks in the area are similar to those found on Mars, and the scientists said that the rocks at Clachtoll were formed under similar conditions to rocks found on Mars. This makes the Scottish Highlands an ideal location for studying the potential for life on Mars.
Previous Research And Future Implications
It is not the first time Scotland's ancient geology has been used by scientists to help them understand how life could have existed on Mars. Last year, technology which will be used in the search for evidence of Martian life was tested by a University of St Andrews team at Lower Diabaig, in Torridon. The rocks in the area are billions of years old and similar to those found on the Red Planet.
Eight years ago, a Nasa Mars rover, Curiosity, explored a part of the planet named after Torridon. Martian geological areas and features have been named by Nasa after places on Earth. Several of the names were taken from Scotland and, as well as Torridon, there is a Siccar Point, Muck, Wick, Sandwick and Holyrood on Mars.
Conclusion And Future Outlook
The research in the Scottish Highlands is an important step in the search for life on Mars. By studying the rocks and geological features in the area, scientists can gain a better understanding of the potential for life on the Red Planet. The discovery of potential biosignatures by the Perseverance rover is a promising sign, and further research is needed to determine the origin of these signs and the potential for life on Mars.
Sources
This is an original synthesis by Qivorane based on reporting from the outlets below.
