It is pronounced Eye-Oh with the two letters being two distinct syllables. An equally acceptable pronunciation which is more historically consistent with its Greek origin, is ee-yoh. Refer to the Greek letter, iota which is pronounced yota, and is itself derived from the Phoenician letter yodh.
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Jupiters Moon: Io
jupiters ice moon is Io
It is pronounced Eye-Oh.
Jupiter's moon Io may be the most volcanically active object in the solar system. Some of Io's volcanoes have been observed to erupt into orbit.
A year on Io, one of Jupiter's moons, is equivalent to 1.77 Earth days due to its orbit around Jupiter.