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  • David Conrad

    Io orbiting Jupiter. Image taken by Cassini spacecraft as it flew past Jupiter many years ago.

  • Helen Williamson

    Io: Moon Over Jupiter 8 April 2012 Astronomy Picture of the Day This Cassini photo shows Jupiters moon, Io. Io is the most volcanic body in the solar system and is about the size of Earths moon.

  • Omar Santos

    Io: Moon Over Jupiter (Apr 8 2012) Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA How big is Jupiter's moon Io? The most volcanic body in the Solar System, Io (usually pronounced "EYE-oh") is 3,600 kilometers in diameter, about the size of planet Earth's single large natural satellite. Gliding past Jupiter at the turn of the millennium, the Cassini spacecraft captured this awe inspiring view of active Io with the largest gas giant as a backdrop (...) #astronomy

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Io: The Prometheus Plume Credit: Galileo Project, JPL, NASA Two sulfurous eruptions r visible on Jupiter's volcanic moon Io in this color composite image from the robotic Galileo spacecraft that orbited Jupiter from 1995 to 2003. @ the image top, over Io's limb, a bluish plume rises about 140 kilometers above the surface of a volcanic caldera known as Pillan Patera. In the image middle, near the night/day shadow line, the ring shaped Prometheus plume is seen rising about 75 kilometers above

Jupiter and Io. "The image shows a major eruption in progress on Io's night side, at the northern volcano Tvashtar. Incandescent lava glows red beneath a high volcanic plume, whose uppermost portions are illuminated by sunlight. The plume appears blue due to scattering of light by small particles in the plume."

This amazing shot of Io and Jupiter is making the rounds... but is it real? Well, kinda. I explain it all here: blogs.discovermag...

Jupiter and Its Moons Photograph courtesy NASA This family portrait, a composite of the Jovian system, includes the edge of Jupiter (with the Great Red Spot visible) and Jupiter's four largest moons, known as the Galilean satellites. From top to bottom are Io, Europa, Ganymede, and Callisto. The smallest of these four moons, Europa is about the size of Earth's moon.

Io’s interior is composed of molten iron sulphide, and the surface is a crust of sulfur and silicon.  Io has more than 400 active volcanoes, which can eject lava plumes more than 500 kilometers above the surface.

Jupiter has 64 moons, and from top to bottom, the moons shown are Io, Europa, Ganymede and Callisto.

Io, Jupiter by New Horizons

Jupiter and its moon Io. Io's shadow is visible on the planet's surface. (Hubble)

New Volcano Eruption on Jupiter's Io - 10,000 Times Iceland's 2010 Event : The tidal push-and-pull of massive Jupiter heats up the interior of its moon, Io, making it the most volcanically active known body in our Solar System. Captured August 29, 2013, this image reveals the magnitude of one of the brightest volcanoes ever seen on our Solar System. Io became alive with volcanism in the middle of 2013