Carbon dioxide gas
The intriguing phenomenon of ‘dark spiders’ on Mars, observed in the region known as Inka City, is a testament to the dynamic and complex processes at play on the Martian surface https://orbitaltoday.com/2024/05/02/new-satellite-images-reveal-hundreds-of-dark-spiders-on-mars-inka-city-are-they-real/ These formations, while bearing a resemblance to arachnids, are in fact the result of seasonal eruptions of carbon dioxide gas
