This image taken 12 December 2000 and released by NASA 22 March 2001 shows a crack (Upper L) on Pine Island glacier is also seen by the ASTER instrument, on board the TERRA satellite. At its widest point, the crack is 400-500 meters across. Scientists believe that the crack appeared rapidly, less than five weeks, and would begin calving icebergs in approximately 18 months. On the left hand side of the image, stress fractures in the ice are clearly seen. AFP PHOTO (Photo by - / NASA / AFP) (Photo by -/NASA/AFP via Getty Images)