Jupiter's Moon IO is a World of Fire and Lava | The Planets | BBC Earth

Io is the closest of Jupiter’s larger moons and the most volcanic world in our solar system, with over 300 active volcanoes, thanks to its proximity to the huge gravitational pull of Jupiter.
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The Planets
Professor Brian Cox tells the dramatic stories of the eight majestic planets of our solar system. The latest science allows us to piece together clues of magnificent lost waterfalls on Mars, the mass planetary migrations as they jostled for position early in their history, and even the distant fate of Saturn as one of its moons awakens to form a beautiful water world.

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