Futility Closet

Ice Rings

Posted in Oddities by Greg Ross on August 12th, 2009

http://commons.wikimedia.org/wiki/File:Circles_in_Thin_Ice,_Lake_Baikal,_Russia.jpg

What’s 2.5 miles wide, perfectly circular, and warm enough to melt ice?

I don’t know either, but there are at least two of them in Russia’s Lake Baikal.

They were spotted in April from the international space station.