Giant, spinning ice disc in Maine river defies explanation, draws crowds

A nearly perfect disc of ice formed in the Presumpscot River.

The massive ice disc drew curious onlookers to the banks of the river.

It's not clear exactly how or when it formed.

Scientists aren’t exactly sure why these spinning ice discs form, either, although some believe the temperature of the water has something to do with it. The discs have been recorded across North America and Europe over the past 100 years.

According to an official with the city of Westbrook, the disc is roughly 100 yards across and is spinning in a counter-clockwise direction.