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A space probe
passing above the surface of one of Jupiter's moons has heard it
roar.
Galileo picked
up a change in the density of charged particles in the magnetic
field as it passed over the north and south poles.
Nasa scientists
converted them into sound and learned more about the source.
Dr Donald Gurnett,
from the University of Iowa, said: "You hear a whistling sound
from Jupiter's radio emissions, then, just when you go over the
pole, you hear a tremendous roar that starts abruptly, then stops
abruptly."
The sound is
like the noise from a huge electrical power generator. The moon
generates as much wattage as about 1,000 nuclear power plants.
The probe has
also taken new images of the moon including one of a colourful volcanic
crater named Tupan Patera.
The picture
shows lava on the surface interacting with high sulphur materials
and is only slightly different in colour to what the human eye would
see.
Story filed: 12:48 Tuesday 11th December 2001
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