Jupiter’s massive shadow causes Io’s sulfur dioxide atmosphere to freeze and collapse onto its surface, which then reverts to gas and restructures when back in sunlight, constantly undergoing collapse and repair. Io is a volcanic moon with at least 67 moons.
Jupiter is by far the largest planet in the solar system. The planet’s massive size — and hence its massive shadow — has a profound effect on one of Jupiter’s largest moons, Io. Io’s atmosphere is composed of sulfur dioxide gas. When Jupiter’s shadow passes, Io’s atmosphere freezes and collapses onto the moon’s surface. When the eclipse passes and the moon is back in sunlight, the atmosphere reverts to gas and restructures. In this way, Io’s atmosphere is constantly undergoing collapse and repair.
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Jupiter is thought to have at least 67 moons. The four largest moons are Ganymede, Callisto, Io and Europa.
Io is a volcanic moon. Its volcanoes are the source of the sulfur dioxide that makes up its atmosphere.
One Ionian day equals approximately 1.7 Earth days.
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