ASTER image of Baektu Mountain, an active volcano on the border between North Korea and China

A 2014 ASTER image of Baektu Mountain, an active volcano on the border between North Korea and China. The crater lake at the summit is called Heaven Lake. ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) is an instrument, resulting from a U.S. and Japanese partnership, that is aboard NASA's Terra satellite. The USGS Earth Resources Observation and Science (EROS) Center houses NASA's LP DAAC, which archives and distributes ASTER data. Image courtesy of NASA.