Horizon follows an international team of volcanologists in Iceland as they draw fascinating parallels with the volcanoes on Earth and those elsewhere in the solar system. Through the team's research, we discover that the largest volcano of the solar system - Olympus Mons on Mars - has been formed in a similar way to those of Iceland, how a small moon of Jupiter - Io - has the most violent eruptions anywhere, and find out that a moon of Saturn called Enceladus erupts icy geysers from a hidden ocean. Computer graphics combined with original NASA material reveal the spectacular sights of these amazing volcanoes. Along the way, we learn how volcanoes are not just a destructive force, but have been essential to the formation of atmospheres and even life. And through these volcanoes of the solar system, scientists have discovered far more about our own planet, Earth- hat it was like when Earth first formed, and even what will happen to our planet in the future.
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