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How far into outer space have space probes penetrated?
Outer space, a place of enormous distances: for more than 30 years, unmanned spacecraft have journeyed to learn more about the depths of space, its planets and the nature of interplanetary space. Now, billions of kilometres from Earth, space probes are entering areas never before explored by humankind.
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Last update: 30/11/2009 08:54:20