ORONO, Maine (AP) — A University of Maine professor has died while conducting research in Antarctica. The university says 50-year-old Gordon Hamilton died Saturday when the snowmobile he was riding hit a crevasse and he fell 100 feet. He had been in Antarctica doing research for the National Science Foundation. His work focused on the role of ice and glaciers in the climate system. Hamilton began working at the University of Maine’s Climate Change Institute in 2000.