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On 13 August, Comet 67P/Churyumov-Gerasimenko reaches its closest point to the Sun (perihelion) and the Rosetta orbiter will be there to see exactly what happens. Rosetta will continue monitoring the comet’s activity until the extended mission ends, in September 2016, to increase our understanding of how a comet changes during its orbit and as it approaches and moves away from the Sun.