GREENLAND — Researchers have discovered what may be another massive crater below Greenland's ice sheets, NASA announced on Monday. <br /><br />According to Space.com, the suspected crater is around 22 miles or 36 kilometers wide, but has not been definitively identified yet as an impact crater. <br />According the NBC News, this comes just months after other scientists discovered a 19-mile-wide impact crater under the Hiawatha glacier. <br />Joe MacGregor, a glaciologist at NASA's Goddard Space Flight Center, is a co-author of the paper published in the journal Geophysical Research Letters, which describes the find. He was also on the team that found the Hiawatha crater. <br />After the finding the Hiawatha crater, MacGregor and his team analyzed topographic maps and satellite imagery to see if there might be other craters in the area. <br />That's when they discovered the second bowl-shaped feature 114 miles southeast of the Hiawatha crater. <br /><br />According to NBC, the presence was confirmed using Operation IceBridge data, an ongoing NASA mission which uses planes to map changes in ice in the polar regions. <br />In order for researchers to determine if this second structure is actually an impact crater, scientists will need to conduct more field work or obtain core samples to confirm the discovery. <br />According to NBC, the team says they are unsure how old the structure is, but they estimated it was formed 100,000 to 100 million years ago.
