: Around 4.5 billion years ago
: January 7th 1610 by Galileo Galilei
Distance from Jupiter
: Between 260,975 miles (perigee) and 263,088 miles (apogee)
Distance from the Sun
: Around 484,000,000 miles
Time to Orbit Around Jupiter
: Less than 2 Earth days
Total Surface Area
: 26,041,666 square miles
13 Io Facts for Kids
Io formed around 4.5 years ago.
Io was discovered by Galileo Galilei on January 7th, 1610.
Io is one of Jupiter’s seventy-nine known moons.
Io has a radius of about 1,131 miles.
The closest Io gets to Jupiter is 260,975 miles (perigee).
The farthest Io gets from Jupiter is 263,088 miles (apogee).
It takes Io less than two Earth days to orbit the planet Jupiter.
The atmosphere and lack of water molecules on Io make it extremely unlikely life as we know it could have evolved.
Io is the densest moon in our solar system.
Io is the most geologically active moon and object in our solar system, with over 400 active volcanoes.
Io is the fourth largest moon in our solar system.
Io is named after Io, a mythological priestess of Hera, who was one of Zeus’s lovers.
Jupiter Moon Facts
Callisto Moon Facts
Europa Moon Facts
Ganymede Moon Facts
Io Moon Facts
Pictures of the moon Io
A full color full of Jupiter's Moon Io.
A photo of a volcanic eruption on Io.
A photo of Io's shadow casted on Jupiter.
Additional Resources on Jupiter's moon Io
Io Moon - Wikpieda
– Find out more amazing thingsd about Io on the Wikipedia website.
This is our best look yet at Io, the solar system's most volcanic object
– Learn more about our solar system's most volcanic object: Io..
Io: Facts about Jupiter’s Volcanic Moon
– Dive deeper into Io on the Space.com website.
Overview | Io – NASA Solar System Exploration
– Discover more facts about Europa on the NASA Solar System Exploration website.