The Rendezvous

          The most difficult part in the mission of Rosetta was the rendezvous with the comet being in movement. This action had many complications, as the high velocity of the comet or breaking any piece of the unit on the landing.
          When the unit was reactivated, the thrusters fired for many hours until the velocity was reduced to 25 m/s. From this moment, the drift was increasingly descending and after 90 days the velocity was of 2 m/s.

          Before the arrival, Rosetta had taken pictures of the comet and made calculations to make possible the touchdown, this made possible the success, Rosetta started sending pictures of the 67/P, with very precise information and being able to look for landing sites, there were five possible.
          Eventually, the spacecraft was inserted into orbit around the nucleus at a distance of about 25 km.
          Finally on november 2014 the rendezvous was possible. After it was chosed a suitable landing site , the lander was released from a height of about 1 km, this action took place at walking speed.
          Rosetta will continue sending data to the earth, until this december it will pass close to the Earth, more than 4000 days afther the mission began.