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Comet reveals its secrets The first results from the Deep Impact mission to the comet Tempel 1 have shown that the material inside the comet is different to that on the surface. This is confirmed by data from the Rosetta spacecraft -- which is on its way to another comet -- and a host of ground-based telescopes. The Deep Impact mission consisted of a flyby spacecraft and an impactor - roughly the size of a washing machine - that crashed into the comet in the outer reaches of the solar system on 4 July this year.
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