A Norwegian researcher gets ready to drive a snow scooter outside the Troll research station, about 250 km (155 miles) from the sea in Antarctica, January 20, 2008. Aliens are landing in Antarctica. Seeds, spores, mites, lichens and mosses alien to the continent have been brought unwittingly by scientists and tourists, and could disrupt life in the icy wilderness.
Picture taken January 20, 2008. To match feature ANTARCTICA/ALIENS REUTERS/Alister Doyle (ANTARCTICA)