Description
Thoreau in his writings on Walden Pond described these “dark figures, shaped somewhat like a spider’s web, what you may call ice rosettes” in Walden Pond’s frozen surface. Others have speculated that the stars can form when water flows up and out onto ice that has an overlying layer of snow. The water might flow in this branching way because of a kind of wicking or capillary action through the slush, seen here in Cotton.
Photo: Brian Peterson/Star Tribune
