The geologist El-Baz of the University of Boston has detected a two-ring crater using satellite photographs. Located in southwest Egypt, it is the largest crater ever discovered in the Sahara, 31 kilometers in diameter. The geologist has given him the name of Kebira, of large size. El-Baze has only found remains of the crater, which is eroded by water and wind, but has seen it as two craters of the Moon. Geologists still do not know when it was, but they calculate it was created by a meteorite of approximately 1,2 kilometers in diameter.