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MARTIAN HILLS
What forces shaped the complex layers in these Martian hills? One
theory suggests the lower areas are made of older rock, like
sedimentary rock on Earth. The ridges in this image, captured by
the Mars Global Surveyor orbiter, are wide enough for a truck to
drive on them. Three robotic explorers from Earth, arriving over
the holidays, will attempt to unlock other scientific secrets of
the red planet.
(12/24/03)