This handout satellite image from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft shows the Pine Island Glacier in Antarctica November ... more 
This handout satellite image from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft shows the Pine Island Glacier in Antarctica November 13, 2011. In mid-October 2011, NASA scientists discovered a massive crack across the Glacier, a major ice stream that drains the West Antarctic Ice Sheet. Extending for 19 miles (30 kilometres), the crack was 260 feet (80 meters) wide and 195 feet (60 meters) deep. Eventually, the crack will extend all the way across the glacier and calve a giant iceberg that will cover about 350 square miles (900 square kilometres). REUTERS/NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team/Handout less 
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Wed, May 2, 2012 10:57 AM EDT