Io /ˈaɪ.oʊ/ is the innermost of the four Galilean moons of the planet Jupiter and, with a diameter of 3,642 kilometres (2,263 mi), the fourth-largest moon in the Solar System. It was named after the mythological character of Io, a priestess of Hera who became one of the lovers of Zeus.
With over 400 active volcanoes, Io is the most geologically active object in the Solar System. This extreme geologic activity is the result of tidal heating from friction generated within Io's interior as it is pulled between Jupiter and the other Galilean satellites—Europa, Ganymede and Callisto. Several volcanoes produce plumes of sulfur and sulfur dioxide that climb as high as 500 km (300 mi) above the surface. Io's surface is also dotted with more than 100 mountains that have been uplifted by extensive compression at the base of the moon's silicate crust. Some of these peaks are taller than Earth's Mount Everest. Unlike most satellites 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. Most of Io's surface is characterized by extensive plains coated with sulfur and sulfur dioxide frost.
The Moon is the only natural satellite of the Earth, and the fifth largest satellite in the Solar System. It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having a quarter the diameter of Earth and 1⁄81 its mass. The Moon is the second densest satellite after Io, a satellite of Jupiter. It is in synchronous rotation with Earth, always showing the same face; the near side is marked with dark volcanic maria among the bright ancient crustal highlands and prominent impact craters. It is the brightest object in the sky after the Sun, although its surface is actually very dark, with a similar reflectance to coal. Its prominence in the sky and its regular cycle of phases have, since ancient times, made the Moon an important cultural influence on language, calendars, art and mythology. The Moon's gravitational influence produces the ocean tides and the minute lengthening of the day. The Moon's current orbital distance, about thirty times the diameter of the Earth, causes it to appear almost the same size in the sky as the Sun, allowing it to cover the Sun nearly precisely in total solar eclipses.
Jupiter's Moon Io Erupts
Explosive Planet Io - Wonders of the Solar System - BBC Two
The Electrical "Volcanoes" of Jupiter's Moon Io | Space News
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Io Moon of Jupiter
Io, Moon of Jupiter
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Jupiter's moon Io. (AggManUK)
NASA | New Horizons: Volcanic Eruption Plume on Jupiter's moon Io (1/2) [HD]
IO the moon and the Giant
Io Jupiter Moon
Jupiter's Moon Io Erupts
Explosive Planet Io - Wonders of the Solar System - BBC Two
The Electrical "Volcanoes" of Jupiter's Moon Io | Space News
NASA Sound of Space - Jupiter's Moon Io
Jupiter's moon Io: A Volcanic Inferno
Io Moon of Jupiter
Io, Moon of Jupiter
The Sounds of the Jupiter's moon Io
Voyage to the planets: Jupiters moon Io
Jupiter's Moon: Io Rotation - HD
Jupiter's moon Io. (AggManUK)
NASA | New Horizons: Volcanic Eruption Plume on Jupiter's moon Io (1/2) [HD]
IO the moon and the Giant
Io Jupiter Moon
The Entities on IO MOON (R$E)
THE MOON:イオ・エウロパ・タイタン:Io・Europa・Titan
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Io (moon)
Jupiter moon eclipse & great red spot timelapse animation (near opposition) 2014
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Orbiter 2010 - [Part 11] IMFD Jupiter Moon Hopping - Europa to Io
Orbiter 2010 - [Part 12] IMFD Jupiter Moon Hopping - Europa to Io
Orbiter 2010 - [Part 13] IMFD Jupiter Moon Hopping - Europa to Io
Astronomy C12 - 2014-10-28: Jupiter and its moons, especially Io and Europ
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Midwest.io 2014 - To the Moon and Back: Taking the Leap Towards Solving Big Problems - Julia Elman
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Kuiper Belt Objects and Io, Europa & Triton (Documentary)
Jupiter's Moons Io and Europa Transit
On Jupiter - Documentary 2013 ( full ) - Documentary 2013 full
NASA Voyager Space Sounds - Sphere Of IO
Igni Plays: The Moon Sliver (Indie Horror)
Orbiter 2010 - Learn With Me #1 (Part 5) - Landing on IO
Sound of the Sun (HD)
Dawn of Midi - Dysnomia (2013) HD
Volcanoes: Near, Far and Really Far Away
Hubble's Amazing Universe Documentary HD
Virtual Star Party - January 12, 2014: The Planetary Show!
Hubble Observes Rare Jupiter Conjunction
Charlene Soraia - Moonchild [2011 Full Album] HQ/HD
GUITAR DEL MAR VOL 02 (Raccolta completa by lilly)
Jupiter rotating and occulting its moon Io
Io - Ganymed Occultation (Jupiters Moons) through Telescope
Jupiter and Io 2015-02-07
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EXPEDITION IO
a MOOn of Jupiter Io
Jupiter and 4 moons (Callisto, Ganymede, Io, Europa) zoomed in
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FHD/Fullscreen please! Jupiter and 4 moons (Callisto, Ganymede, Io, Europa) (2nd video)
FHD/Fullscreen please! Jupiter and 4 moons (Callisto, Ganymede, Io, Europa)
Spoutwood Farm Observatory Jupiter Io-Europa Double Transit Composite Rotation Video
Jupoter's moon Io in transit
Io (mythology)
Drumband Koninklijke Harmonie van Thorn - IO The Giant and the Moon - 29-09-2012
영화 파리넬리 中 '울게 하소서' 카운터 테너 문지훈 - Lascia chio pianga
Io Sono Dice il Signore
Pinball Io Moon
Galilean moons III.Io
Orbiter 2010 - [Part 14] IMFD Jupiter Moon Hopping - Europa to Io
Chiara Civello feat. Chico Buarque - Io che amo solo te