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Voyager 1 finds volcanoes on Io

NASA scientists were surprised to find that Io is the Solar System's most volcanically active body. The Voyager probes, launched in 1977, showed them Io's numerous volcanoes. The constant sulphur eruptions across Io's surface are powered by Jupiter's strong gravitational attraction, which heats the interior of the moon.

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The Planets RevisitedTerra Firma: Are We Alone

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