Spacecraft Captures Io Volcanoâs âHot Breathâ
Jupiterâs moon Io is the most volcanically active world in the solar system. Several spacecraft that have orbited Io in past years have captured pictures of different volcanoes ejecting huge plumes of gas and particles.
In early August, NASAâs Galileo spacecraft captured a shot of the biggest volcanic plume ever seen. Gas and dust from the volcano rise about 310 miles above the surface.
The plume was a surprise to Jet Propulsion Laboratory volcanologist Rosaly Lopez, who said the site had shown little evidence of previous volcanic activity. âThis new one sprang up suddenly,â she said.
The material comes from a previously undiscovered and still unnamed volcano near Ioâs north pole. Galileo flew by the volcano on Aug. 5.
Galileo did more than just take pictures of the volcano. It also caught particles freshly released during the explosion--giving scientists a direct sample of extraterrestrial volcanic material to analyze.
âWeâve had wonderful imagesâ of volcanoes before, said one of the missionâs scientists, Louis Frank of the University of Iowa. âBut weâve never caught the hot breath from one of them until now. Galileo smelled the volcanoâs strong breath and survived.â
He characterized the particles as âsnowflakesâ made of frozen sulfur dioxide.
Io, the innermost of Jupiterâs four largest moons, is about the same size as Earthâs moon. Galileo will fly by the moonâs south pole on Oct. 16 to investigate another volcanic hot spot there.
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Jupiter Volcano
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