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Comets are the best samples of primitive solar nebula material presently available to us，dating back 4.6 billion years to the origin of our planetary system.Past missions to comets have all been"fast flybys"，they provided only a snapshot view of the dust and ice nucleus，the nebulous coma surrounding it，and how the solar wind interacts with both of these components.
Rosetta is now taking a more prolonged look.The spacecraft is an ESA mission，with contributions from member states and from NASA，and it currently orbits the Jupiter family comet 67P/Churyumov-Gerasimenko.Rosetta met the comet nucleus on 6 August 2014，at 3.7 astronomical units（AU）from the Sun，and delivered the Philae lander to the nucleus surface on 12 November 2014，when the comet was 3.0 AU from the Sun.
The data from the Rosetta allow us to build a detailed portrait of comet 67P.These initial observations provide a reference description of the global shape，the surface morphology and composition，and the bulk physical properties of the nucleus.Subsequent measurements with the orbiter and with the Philae lander will further describe the comet over time.
As a milestone in the history of science，the Rosetta mission is very useful for designing the framework of deep space exploration for our own country.