High Quality Content by WIKIPEDIA articles! Thor is an active volcano on Jupiter's moon Io. It is located on Io's anti-Jupiter hemisphere at 39°09?N 133°08?W? / ?39.15°N 133.14°W? / 39.15; -133.14Coordinates: 39°09?N 133°08?W? / ?39.15°N 133.14°W? / 39.15; -133.14. A major eruption with high thermal emission and a large, volcanic plume was observed during a Galileo flyby on August 6, 2001, when the spacecraft flew through the outer portions of the plume allowing for direct sampling. The eruption continued into Galileo's next flyby in October 2001. As seen during high-resolution images taken during the eruption, Thor consists of a series of dark lava flows emanating from a set of nearby volcanic depressions. Before the eruption, the area consisted of red-brown plains, composed of irradiated sulfur, typical of Io's mid- to high-northern latitudes and a set of yellow flows, possibly consisting of sulfur or silicate flows covered by diffuse sulfur deposits. During the New Horizons...

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