Another extreme, but surprisingly lively, environment can be found in Antarctica's Dry Valleys, which are some of the most inhospitable places on Earth: temperatures have fallen as low as -90 degrees Fahrenheit, and winds can blow up to 200 mph. They still host hardy organisms like lichens, mosses, and nematodes that can survive the brutal conditions. Scientists believe that, like the lifeless Atacama, these valleys resemble the environment on Mars; studying how creatures nevertheless manage to survive there could give insight into how life might exist on the Red Planet.