Jupiter’s fifth moon, called Io, is the closest satellite to Jupiter and the most active volcanic body in our solar system. In fact, Io’s surface features lava lakes and liquid rock floodplains. Astronomers have mapped about 150 volcanoes on the moon, some of which spew lava 400 kilometers into space. There are volcanoes all over Io’s surface, and as scientists make observations, new hot spots keep popping up.
His discovery
Galileo Galilei first discovered this moon on January 8, 1610. In fact, he discovered the moon the day before, but was not able to differentiate Io from Europa (another moon of Jupiter) until the following night. It was the first time that a moon was discovered orbiting a planet other than Earth. This discovery led him to understand that the planets orbit the sun, rather than our solar system revolving around the Earth.
Galileo first named this moon Jupiter I. However, in the mid-19th century the moon was renamed Io. In Greek mythology, Io was the priestess of the goddess Hera (the wife of Zeus) and the daughter of Ínaco, the king of Argos. Zeus fell in love with her, but turned her into a cow to prevent his wife Hera from catching him.
Several spacecraft have flown over Jupiter and its moons. Pioneer 10 arrived in 1973, followed by Pioneer 11 in 1974. Then Voyager 1 and Voyager 2 arrived, leaving incredible photographs on their way.
Can there be life on Io?
The interior of Io is made up of a cast iron core o and an outer layer of silicate, giving the planet a speckled appearance of orange, yellow, black, red, and white. Furthermore, according to scientific research, Io was formed in a region around Jupiter where ice and water were abundant.
It is not clear if Io is capable of supporting life, since, although its heat could have made it possible, Jupiter’s radiation could have removed the water from the surface.
This moon stands out for its active volcanoes, which were discovered by NASA’s Voyager spacecraft in 1979. Also, due to volcanic activity , Io’s atmosphere contains mainly sulfur dioxide. Some of the gases that escape ionize and form what is known as the Io plasma torus, a ring of charged particles that occurs around the planet Jupiter.
