Dark patch advancing across Mars surface puzzles scientists

Across the rust-colored face of Mars, something dark is spreading — and the scientists watching from orbit do not yet know what it means. Captured through routine planetary monitoring, an expanding patch on the Martian surface has drawn researchers into a careful investigation that touches geology, atmospheric science, and the enduring mystery of how a distant world truly behaves. It is a reminder that even a planet studied for decades can still produce phenomena that resist easy classification, and that the distance between observation and understanding remains one of science's most humbling