Jupiter's Moon IO

By: Sarah K

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Introduction to Io

Io is a moon of Jupiter. it is the 5th moon and is 4.5 billion years old. Io was discovered by Galileo on January 7, 1610. Galileo proved there were moons orbiting other planets. People at that time thought everything orbited the earth. In 1979, the Voyager spacecraft flew by and took pictures of Io. Io's name comes from Greek mythology. Io is the daughter of Zeus and inachus.

Geology of Io

Io is the most active moon in the solar system. It has many volcanoes that shoot out sulpher 190 miles into the atmosphere. Io's atmosphere is mostly sulfer dioxide. The temperature of Io is - 202 degrees Fahrenheit. It can freeze lava. Some other features of Io are lava pools, lava lakes, liquid rock flood plains, and mountains. The mountains are much taller than Earth's mountains. Most are around 52,000 feet tall.

Orbit and Rotation of Io

Io is not in the shape of a circle. It is in the shape of an oval. Io is larger than Earth's moon and it takes 1.77 Earth days to orbit around Jupiter. its orbit and rotation are synchronous. This means they both take the same amount of time. The same side of Io will always face jupiter. Io is the closest to the clouds of Jupiter of all its moons.
Jupiter's Moon Io Erupts


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