Questions tagged [io]

For questions regarding Io, one of the four moons of Jupiter discovered by Galileo.

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53
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5answers
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Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth?

Io (source): The Moon (source):
5
votes
0answers
66 views

How strong are the strongest Ioquakes?

Jupiter's moon Io is the most geologically active celestial body in our system. It has the strongest volcanoes and quakes. Of course in practice these quakes wouldn't be as dangerous as on Earth for ...
1
vote
1answer
52 views

Why is Io's volcanism chemically so different from Earth's?

Volcanic gases on Earth are mainly water, carbon dioxide and sulfur dioxide, but on Io there is a notable absence of water and carbon dioxide in volcanic gases, since sulfur dioxide is the dominant ...
2
votes
0answers
61 views

Did Io start out as an icemoon?

Looking at the big moons of the outer solar system a clear pattern can be seen. Thick icey surface layers covering rocky mantles and deep down metallic cores. The only outlier is Io as it has no icey, ...
13
votes
2answers
599 views

How can tidal heating lower Io's orbit?

This answer to the question Is Io a magic energy machine? suggests that the energy from the internal heating of Io due to tidal "squishing" as it moves cyclically closer and farther from Jupiter in ...
23
votes
5answers
7k views

Is Io a magic energy machine?

Io gets its volcanic heat from being flexed by Jupiter's gravity, and this seems to go on forever. That sounds like a magic energy source, since Jovian gravity is perpetual and Io seems to remain in ...