New York. NASA's Perseverance rover was surprised in September 2023 when it reached the inner edge of Jezero Crater on Mars. Scientists were surprised.This geological area, called the 'Margin Unit', is located on the edge of Mars' ancient lake, so scientists expected to find sedimentary rock there. Sedimentary rocks, formed from soil and mud on Earth, are considered suitable for preserving the existence of microorganisms. However, the rover found igneous rock in that area, which was different from what it expected. Igneous rocks are considered very important for scientists because they preserve precise details of their formation time. These rocks...