On August 5, 2010, an enormous chunk of ice, roughly 97 square miles (251 square kilometers) in size, broke off the Petermann Glacier along the northwestern coast of Greenland. The Canadian Ice Service detected the remote event within hours in near-real-time data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite. The Petermann Glacier lost about one-quarter of its 70-kilometer- (40-mile-) long floating ice shelf, said researchers who analyzed the satellite data at the University of Delaware.