credit: NASA
India's Gangotri Glacier. This composite image from the ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) instrument aboard NASA's Terra satellite shows how the glacier has retracted since 1780.
credit: NASA
India's Gangotri Glacier. This composite image from the ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) instrument aboard NASA's Terra satellite shows how the glacier has retracted since 1780.