What force caused an area of this planet's surface to spiral like an earthly whirlpool? We gat a glimpse of this strange artifact both before and after a terraforming project, courtesy of Planetside's Terragen 2 Technology Preview, which allows unlimited (global) landscapes and improved skies plus imported 3-D objects such as the giant moon..
Here is a view across the Great Swirl in the desert planet's red crust.
>An arial view shows scattered clouds among the mountains as terraforming begins.
The atmosphere grows denser and the land turns green as terraforming nears completion.
>A branch of an inland sea lies beyond the newly verdant Great Swirl.
