Onekotan island is a 50-kilometer-long volcanic double caldera in the Russian federation, in the western Pacific. A caldera is a depression that form when a magma chamber under the volcano collapses, creating the crater. The huge caldera on the left, called Tao-Rusyr, has filled with water since its collapse, and a new volcano - krenitzyn -- is now building up once again. This picture, taken in January 2011 by an astroanut on the International Space Station, is a study in contrasts. The frigid snow covering the volcanic island belies the terrible power and heat below.

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Credit: NASA