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Jupiter’s moon Io may have been volcanically active ever since it was born

An analysis of the moon’s atmospheric composition suggests that it has been spewing sulfur for roughly 4.6 billion years.

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Jupiter's moon Io has been a volcanic inferno for billions of years

4.5 Billion Years of Volcanism on Jupiter’s Moon Io Revealed by Atmospheric Isotopes

Jupiter's violent moon Io has been the solar system's most volcanic body for around 4.5 billion years