White patches in the image are areas of frost made of sulfur dioxide instead of water. Io was found to have at least 12 active volcanoes erupting lava at temperatures over 1200 degrees Celsius. Io has an iron core just like Earth, meaning it could have its own magnetic field. Jupiter's fifth moon, Io, is the most volcanically active body in the solar system. Io is the third largest of Jupiter's moons and very similar in size to our own moon. These particles originate in Io's upper atmosphere but are excited from collisions with ions in the plasma torus (discussed below) and other processes into filling Io's Hill sphere , which is the region where the moon's gravity is predominant over Jupiter. Instruments aboard the space probe Galileomeasured infrared energyemitted by volcanic hot spots on the satellite's surface. Io is one of Jupiter’s many moons. Robotic missions to Io could study its volcanism in closer detail. Io is made mostly of silicate rocks, and its surface is painted with sulfur particles from the volcanoes and frosts that are created as the atmospheric gases freeze out and fall to the ground. In comparison, the greatest known tides on Earth are less than 20 meters. Io’s surface can rise and fall one hundred meters. Volcanic plumes rise almost 190 miles (300 km) above the surface. Its volcanic plumes and lava flows produce large surface changes and paint the surface in various shades of red, yellow, white, black, and green, largely due to the sulfurous compounds.

It is the most volcanically active object in the solar system. Io's surface is littered with hundreds of volcanic calderas. Jupiter's moon Io is 778 million kilometers from the Sun. The heat for this volcanism comes from the special position of Io relative to Jupiter and the other moons. Explore Jupiter's innermost Galilean moon with Astrum. The volcanology of Io, a moon of Jupiter, is the scientific study of lava flows, volcanic pits, and volcanism (volcanic activity) on the surface of Io.Its volcanic activity was discovered in 1979 by Voyager 1 imaging scientist Linda Morabito. Io is the third largest of Jupiter's moons and very similar in size to our own moon. Jupiter's moon Io looks like a giant pizza. The vivid colors are caused by collisions between Io's atmospheric gases and energetic charged particles trapped in Juiter's magnetic field. Io is the size of Earth’s moon, and Jupiter has a diameter that is 11 times larger than Earth’s.
This creates periodic fissures and cracks in Io’s surface that open and close as the moon is literally squeezed and pulled in different directions.
This poor moon suffers from huge "Io-quakes" and violent volcanoes. Auroral Glow: This eerie view of Io was acquired by the Galileo spacecraft while the moon was in Jupiter's shadow.Gases above the satellite's surface produce a ghostly glow that can be seen at visible wavelengths. Surrounding Io (up to a distance of 6 Io radii from the moon's surface) is a cloud of neutral sulfur, oxygen, sodium, and potassium atoms. It is the most volcanically active object in the solar system. The surface is extremely young, and is constantly reshaping itself.

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