What we learned about Lutetia
29 March 2012 Last updated at 19:15 BST
Europe's Rosetta probe made a swift flyby of the Asteroid Lutetia in 2010.
The spacecraft acquired many images and remotely sensed data that scientists continue to analyse today.
Colin Snodgrass from the Max-Planck Institute for Solar System Research (MPS), Germany, recalls what happened during the flyby.