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The spacecraft Rosetta will on Friday crash itself into Comet 67P Churyumov-Gerasimenkowith, 12 years after it was launched into space. The collision will almost certainly end in the destruction of the spacecraft. Professor Mark McCaughrean from the European Space Agency explained what is one of the most audacious space missions ever undertaken. (Photo: Comet 67P Churyumov-Gerasimenko. Credit: ESA)