NASA Finds Tree-Shaped Frost on Mars AP

Peering down through stormy Martian skies, a NASA spacecraft has found tree-like shapes dotting the red planet’s south pole. But what appears to be rolling hills covered with vegetation are most likely sand dunes topped with melting frost, scientists said Tuesday. The latest images from the $250 million Mars Global Surveyor that has been mapping the planet since March offer new insight into the weather there.