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.