Astronomy Picture of the Day
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September 4, 1995
Ganymede: Moonquake World
Ganymede probably undergoes frequent ground shaking events not unlike
Ganymede, the largest moon of
Jupiter and the
has a thick outer coating of water ice. Passing Voyager spacecraft
found a large number of cracks and grooves in the ice so it is
thought that Ganymede, like the
Earth, has large shifting surface
masses called tectonic plates. Ganymede was discovered by
Marius in 1610, and is larger than the planets Mercury and Pluto. The
NASA spacecraft Galileo
is scheduled to arrive at Jupiter is December of 1995.
Tomorrow's picture: Europa: Ancient Water World
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