![]() How long is a day on Io? A picture of Io taken by the Cassini space probe with Jupiter in the background On the other hand, there are mountains such as Epaphus Mensa, named after Epaphus, son of Io and Zeus and Ot Mons - in Mongolian mythology, Ot Ene (the final "e" is pronounced) is the goddess of marriage, who was born at the beginning of the world, when the sky and the earth separated. Danube Planum is based on the Danube river, which runs from southwest Germany to the Black Sea, while Egypt Mons is based on Egypt. They all end in several Latin words vaguely meaning mountain. Io's mountains are a mix of many mythologies, in the aspects of their names. Ra in Egyptian mythology was the god of the sun. Another example would be another volcano named Ra. For example, Masubi is a volcano, but in Japanese mythology, he is the deity of fire who is said to have caused 8 volcanoes on earth. Io's volcanic features are all based on various beings in mythologies other than Greek mythology and Roman mythology. For example, the largest regio, Colchis Regio correlates to Colchis Kingdom in 550-164 BC. All of the regions are named after ancient kingdoms and empires of Earth, similarly to how most planets and stars are named after gods and other characters from mythology. Io has 10 named regions (regions on the Earth would be the Middle East, the Far East, the West, etc) which all end in the word Regio, which means in Latin Region. This is why the surface of Io has so many colours. When sulfur warms up and cools down, it changes colour. The colour of the surface is due to sulfur being at different temperatures. In addition to volcanoes, Io also has many mountains, lakes of molten sulfur, calderas, and flows of molten sulfur or silicate hundreds of kilometers long. This is much colder than −90☌, the coldest it gets in Antarctica. But most of Io is very cold, as it is so far away from the sun. At some spots, near volcanic eruptions, the temperature is very hot. There are also shield volcanoes on Io, formed mostly from lava flows. Sometimes the volcanoes erupt more calmly, more like geysers on Earth. ![]() 500 km is more than the distance from ground level on Earth to the International Space Station. Because of the low gravity of Io and the explosiveness of the volcanoes, sometimes they eject material as far as 500 km above the ground. Because there is so much volcanic activity, the surface is almost free of craters. Unlike most moons, Io has a "young" surface. What is its surface like? Io size compared to Earth and Earth's Moon It is a similar size to our Moon (but a lot more exciting!). It only has a mass of about 1.4% of the mass of Earth. Io is one of these four, and the third largest. Jupiter has 66 moons, but only four are large ones comparable to our Moon. ![]()
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