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comets

An artist's impression of ESA's Rosetta approaching comet 67P/Churyumov-Gerasimenko. The comet image was taken on August 2, 2014, by the spacecraft's navigation camera at a distance of about 500 km. The spacecraft and comet are not to scale.
Science
Scientists prepare for a historic landing on a ‘seething and sputtering and spitting’ comet
Comets to Watch for in 2013