Io
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Io the third largest of Jupiter's moon is very unique in several ways. First of all it has a thin atmosphere. Only two other moons in the solar system have an atmosphere, Saturn's Titan and Neptune's Titan.
Io's atmosphere gives off a strange bright yellow
Glow from its sodium atoms, as if it has a halo.
Io also has several active volcanoes. In fact it is the
Most volcanic place in our solar system.