The Rosetta spacecraft has arrived at Comet 67P/Churyumov-Gerasimenko. More from ESA at http://bit.ly/ESA_Rosetta Sixty Symbols solar system: http://www.sixtysymbols.com/planets Brief discussion here with Professor Ed Copeland. Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/#!/periodicvideos This project features scientists from The University of Nottingham http://bit.ly/NottsPhysics Sixty Symbols videos by Brady Haran A run-down of Brady's channels: http://bit.ly/bradychannels