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On 6th August, the space probe Rosetta ends its 10 year journey and arrives at Comet 67P/Churyumov-Gerasimenko. If all goes well, Rosetta will be the first spacecraft to go into orbit around a comet. The European Space Agency probe will then accompany the comet until December 2015, studying the 4 kilometre-wide lump of ice and rock dust at a level of detail far surpassing any previous comet flyby.

In the words of Rosetta scientist Joel Parker, \u201cPrevious comet missions have been one-night stands, Rosetta will be there for a long term relationship.\u201d

Rosetta will stay with 67P as it heads towards and around the other side of the Sun. Rosetta will be watching everything at close quarters as the comet heats up and produces the classic gas and dust comet tail.

In the final weeks of approach, the Rosetta team have realised this is going to be an even more interesting mission than they had supposed. In the middle of July, the probe\u2019s camera revealed the bizzare shape of the comet\u2019s nucleus. It appears to be formed of two objects joined together. Some have described it as having the shape of a toy duck. \n \nIn November, Rosetta will send a small robot lander, Philae, down onto the comet\u2019s surface \u2013 another hugely ambitious feat, given the feeble gravitational pull of the comet and its complex shape. Philae could bounce off into the void if its trajectory is not quite true and its on-board harpoons fail to secure it to the comet\u2019s icy surface.

Discovery looks ahead to the mission\u2019s key moments and big science questions with planetary scientists and members of the Rosetta science team:

Professor Ian Wright - principal investigator (PI) for the lander\u2019s Ptolemy instrument, \nProfessor Monica Grady - planetary scientist at the Open University, UK.\nMatt Taylor, project scientist on Rosetta \nDr Joel Parker - deputy PI for Rosetta\u2019s Alice spectrometer\nDr Holger Sierks - principal investigator for Rosetta\u2019s Osiris camera\nDr Stephan Ulamec - project scientist for the lander Philae (German Space Agency)

The big questions for Rosetta include: did comets bring water and the essential ingredients for life to the early Earth?

Presented and produced by Andrew Luck-Baker\nImage Credit: Rosetta and Philae at Comet, European Space Agency