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Round discs of barren dirt known as “fairy circles” have long captivated the curiosity of scientists. A groundbreaking new study, harnessing the power of artificial intelligence (AI), has done extensive research on the circle-like patterns in hundreds of fresh locations spanning 15 countries and three continents.

 Historically, these peculiar formations were primarily observed in the arid ecosystems of Southern Africa's Namib Desert and the Australian outback. 

The AI research was published on Monday in the journal Proceedings of the National Academy of Sciences. It describes how a comprehensive search was facilitated by a neural network, a type of AI that emulates cognitive processes to detect patterns or fairy circles. And offers fresh insights into the natural phenomenon.

A team of scientists led by Dr. Emilio Guirado, a data scientist at the University of Alicante in Spain, scrutinized the high-resolution satellite images of drylands worldwide. 

Dr. Guirado was also the lead author of the study. He noted, "The use of artificial intelligence-based models on satellite imagery is the first time it has been done on a large scale to detect fairy-circle-like patterns."

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Fairy circles viewed through AI

The initial phase of the study involved training the neural network by inputting over 15,000 satellite images captured in Namibia and Australia. Half of these images showcased fairy circles, while the other half did not.

 Subsequently, the AI was fed a dataset comprising satellite views of nearly 575,000 plots of land worldwide, each measuring around 2.5 acres (1 hectare). The neural network meticulously examined vegetation patterns within these images and pinpointed repeating circular formations.

However, the process was not entirely automated. Guirado explained, "We had to manually discard some artificial and natural structures that were not fairy circles based on photo-interpretation and the context of the area."

The outcome of this extensive analysis revealed 263 dryland locations where the circular patterns were observed in Namibia and Australia. These arid anomalies were distributed across various regions, including Africa's Sahel, Western Sahara, and the Horn of Africa, as well as Madagascar, Midwestern Asia, and central and Southwest Australia.

 According to Dr. Stephan Getzin, a researcher at the University of Göttingen in Germany, what sets fairy circles apart is the "strongly ordered pattern" between these circles. Dr. Getzin emphasized that this spatial periodicity is notably more organized than other patterns identified in the study.