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The Grey Glacier located in the Torres del Paine National Park in Chile. This 17 miles long glacier begins in the Patagonian Andes Mountains to the west and terminates in three distinct lobes into Grey Lake. The image, taken by an astronaut aboard the ISS, captures a striking blue coloration of the glacier. The colouring is due to the ice’s absorption of red wavelengths of light and scattering of blue wavelengths of light as it is transmitted through the ice. Certain portions of the glacier are indeed gray. Linear gray-brown moraines are accumulations of soil and rock debris that form along the edges of a glacier as it flows downhill across the landscape.

Credit: NASA/JPL.