On the 2nd of March 2004 Rosetta, a spacecraft of the ESA (European Space Agency), built in Friedrichshafen, started from the earth to reach the asteroid Tschurjumow-Gerasimenko.
To reach the correct distance, the spacecraft needed to make swing-by manoeuvres, also called gravity manoeuvre, to save a lot of fuel, by flying close to the earth, Mars and the asteroids (2867) Šteins and (21) Lutetia and used their gravity to get faster. In June 2011 the spacecraft Rosetta made a 957 days long “hibernation” called the deep-space-hibernation. In January 2014 the spacecraft finished its hibernation and got close to the asteroid. Now, on the 12th of November, Rosetta sent the landing probe Philae to the ground of the asteroid. Seven hours later, Philae landed on Tschurjumow-Gerasimenko, which meant great success for the ESA. The scientists hope to know more about the chemical bondage of our solar system with chemical and physical measurement.