Comet 67P/Churyumov-Gerasimenko, illustration. This comet is around 3.5 by 4 kilometres and has two lobes. The European Space Agency's Rosetta spacecraft was launched in March 2004 on a 10 year mission to reach this comet. It entered orbit on 6 August 2014 at a point in the comet's orbit beyond the orbit of Mars. The first mission designed to land on a comet, it is carrying instruments and a lander to map and study the comet's surface and core. The lander Philae, successfully landed on the comet on 12th November 2014.