Posted by tourdemars to Life on Mars at September 22, 2004 10:34 AM

It seems wherever scientists look on Earth they can usually find some kind of lifeform eking out an existence. And microbe colonies discovered living under rocks in the Arctic and Antarctic are just the latest example. Their high-latitude polar habitats are among the most extreme on the planet, with damaging levels of ultraviolet light as well as sub-zero temperatures.