.The European Space Agency (ESA) launched the Rosetta mission on March 2, 2004.
Rosetta went where no space mission had been before! It caught up with a comet in deep space and went into orbit around it. Its lander Philae was the first ever to land on a comet. At the end of the mission, Rosetta also landed on the comet to join it and Philae on the comet's journey.
https://www.bellaonline.com/articles/art300391.asp.