Galileo spacecraft true-color image of Io. Io is often referred to as a celestial body of fire and ice. But Io’s volcanoes can reach 3,000 F (1,649 C). Temperature: Io’s surface temperature averages about minus 202 degrees Fahrenheit (minus 130 Celsius), resulting in the formation of sulfur dioxide snowfields. Unlike most moons in the outer Solar System, which are mostly composed of water ice, Io is primarily composed of silicate rock surrounding a molten iron or iron sulfide core….Io (moon) Discoveryġ.769137786 d (152853.5047 s, 42.45930686 h)

The density of iron is about 5, and that of silicate rock is 3, so the inside of Io must be made out of rocky material and sulfur. An idea of the interior composition can be guessed from the density of Io, which is about 3.5. The air of Io is roughly 90% Sulfur, and 10% other simple atoms such as Oxygen.

Aside from Earth, Io is the only known body in the solar system to have observed active volcanoes. The interior of Io is composed of an iron or iron sulfide core and a brown silicate outer layer, giving the planet a splotchy orange, yellow, black, red, and white appearance. The heat for this volcanism comes from the special position of Io relative to Jupiter and the other moons. White patches in the image are areas of frost made of sulfur dioxide instead of water. The surface of Io is completely volcanic, with lava flows of sulfur from the interior, as shown in this image. The water ice is combined with the more abundant sulfur dioxide ice on Io’s surface. “This is the first strong evidence of solid water on the surface of this satellite,” said Dr. Scientists have found water molecules frozen in the surface ices of Jupiter’s moon Io. While most moons in the outer solar system, like Callisto for example, are made up of mostly water ice and rock, Io is composed of silicate rock which surrounds either a molten iron or iron sulfide core. Io is composed of silicate rock surrounding a molten iron or iron sulfide core.

9 What makes Jupiter’s moon Io unique in the Solar System?.

8 What do you need to know about the moon Io?.

7 What kind of rock is the moon Io made of?.

Does io moon have water