ESA's Rosetta mission will rendezvous with comet Churyumov-Gerasimenko in 2014. In November of that year, Rosetta's Philae lander will touchdown on the comet and thoroughly investigate its composition.
ESA Space Scientist Detlef Koschny build a LEGO model of Rosetta mission in order to visualize the complicated orbital choreography used in this space mission.
He then goes on and demonstrates the prototype of the Philae lander he made with his son's LEGO Mindstorms.
Then with help from Steven Canvin from the LEGO Mindstorms Team and other players, a full fledge prototype was built... Here is a fantastic video showing off this prototype:
The feedback from the engineering students on the prototype will be used by ESA, the German Aerospace Center DLR, Europlanet, Lightcurvefilms and LEGO to finalize the Education Kit and adapt it to the needs of European curricula.
Read the full article here.
All video presented here are from the ESA YouTube channel
 Rosetta: Mission to Comet 67P/Churyumov-Gerasimenko [Hardcover]