Aditya-L1, India's first solar mission by ISRO, primarily studies the Sun's corona — the outermost layer of its atmosphere — which can reach temperatures of millions of degrees Celsius. It carries instruments like the Visible Emission Line Coronagraph (VELC) to study solar flares and coronal mass ejections (CMEs) and their impact on space weather. Regolith and craters are surface features of solid bodies, while Aditya-L1 focuses on the corona rather than the magnetosphere.