Moon of Jupiter

What Is It?

Io is a moon of Jupiter. Io is one of the four biggest moons of Jupiter called the Galilean Satellites. It is very volcanic. it has lava lakes, lava flows, calderas, and has geysers.It has a iron core. Io has a thin rocky crust. io has a smooth and changing surface because of lava flowing in to craters and filling them.
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Io Facts

Io was discovered on January 7,1610. The discover was Galileo. It proved everything did not revolve around Earth. The average temperature on Io is -142 C. It orbital and rotation is period 1.76 days. Io is 421,600 km from Jupiter. It is slightly bigger than Earth's moon.
Jupiter's moon Io: A Volcanic Inferno


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