|EXPLORING THE JUPITER SYSTEM|
Jupiter's moon Io:
Most Volcanic World In Our Solar System
Jupiter's sulfurous moon Io is the innermost of the giant planet's four largest moons and the most volcanic world in our Solar System. In fact, Io is peppered with hundreds of volcanoes, several of which might be active at any given moment.
NASA engineers sent the Galileo spacecraft on a close encounter with the north pole of Io on August 6, 2001, to take unprecedented magnetic measurements and to examine the site of a recent volcanic eruption.
Galileo sped across an area of Io called Tvashtar at an altitude of only 200 km.
That area had been seen belching a giant plume of volcanic gases only seven months before. Scientists hoped the volcano might still be active so Galileo could fly right through a volcanic plume for the first time.
Volcanic plumes in Io's polar regions don't show up often and then are short-lived. When they assigned the task to Galileo, the scientists didn't know whether the Tvashtar volcano would be erupting or not.
Tides make Io fiery. Of course, those are not like ocean tides on Earth. Rather, they are tidal bulges in the solid crust of the moon Io. Jupiter's gravitational field and the gravitational fields of its other large moons raise the bulges on Io as high as a 30-story building.
The bulges move as Io orbits the giant planet. Io's crust flexes and heats the moon's interior. That is the source of energy for volcanoes that seem to constantly spew lava.
Galileo also conducted two close flybys of Io in 1999 to study and photograph that moon's intense volcanic activity.
In 2001, Galileo went dashing through the snows of Io. As the spacecraft flew past the north pole of the moon, it sailed through a swarm of sulfurous snowflakes hurled into space by a previously uncharted volcano. Scientists who had not expected the probe to encounter fresh volcanic ash were delighted.
Galileo also photographed a slumping cliff, migrating eruptions and churning lava lakes on Jupiter's sizzling moon.
Learn More About the Jupiter System – the Planet, the Moons, the Rings Jupiter Moons Oceans Volcanos Rings Radio JIMO Galileo Cassini Pioneer Voyager Resources
- Jupiter's Known Satellites
- The Jupiter Satellite Page
- New Moons of Jupiter Discovered in 2003
- Outer Moons Discovered At Jupiter in 2002
- Eleven Moons Discovered in 2002
- Eleven Moons Discovered 2000
- Names for Moons Discovered in 2000
- Moon Rediscovered After 25 Years
- Galileo and its discoveries [NASA JPL]
- Jupiter Home Page [NASA Goddard]
- Jupiter Fact Sheet [NASA Goddard]
- Directory of Planetary Fact Sheets [NASA Goddard]
- NSSDC Planetary Home Page [NASA Goddard]
- Jovian satellite fact sheet [NASA Goddard]
- Moons of the Solar System [STO]
- Galilean Satellite Fact Table [NASA Goddard]
- Jupiter's Known Satellites [Univ of Hawaii]
- The Jupiter Satellite Page [Univ of Hawaii]
- New Moons of Jupiter Discovered in 2003 [Univ of Hawaii]
- Outer Moons Discovered At Jupiter in 2002 [Univ of Hawaii]
- Eleven Moons Discovered in 2002 [Univ of Hawaii]
- Eleven Moons Discovered 2000 [Univ of Hawaii]
- Names for Moons Discovered in 2000 [Univ of Hawaii]
- Moon Rediscovered After 25 Years [Univ of Hawaii]
- Europa facts and pics [SEDS Nine Planets]
- Galileo Project Home [NASA JPL]
- Where is Galileo now? [NASA JPL]
- Interactive guide to volcanoes on Io
- Exploring Jupiter main page [STO]
- Internet Resources [STO]
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