ASTER captured Mount St. Helens volcano in Washington on Aug. 8, 2000. The volcano erupted violently on May 18, 1980, killing nearly 60 people and destroying all life in the area. On April 1, all Earth imagery from ASTER, the prolific Japanese remote sensing instrument aboard NASA’s Terra spacecraft, became free to the public, which provides access to almost 3 million images of Earth dating back to its launch in 1999. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)...