One of the celestial bodies that astronomers and researchers are studying intently is Jupiter's moon Io. New radio images from the Atacama Large Millimeter/submillimeter Array (ALMA) have shown direct evidence of volcanic activity on Io for the first time. The moon has an extremely thin atmosphere, said to be about a billion times thinner than Earth's atmosphere. Despite its extreme thinness, the atmosphere can provide a window into the moon's interior and what's happening below its crust.

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