Mysterious lunar swirls on the moon’s surface may be linked to underground magma activity, a new study suggests. These swirls, created by magnetized rocks, deflect solar wind particles, keeping moon rocks light-colored within the swirls. Researchers, noting the moon lacks a classic magnetic field, propose that underground lava cooling in a magnetic field could create these anomalies. Some swirls, extending for hundreds of miles, challenge the impact theory due to their shape and size, according to NASA’s Lunar Reconnaissance Orbiter images.