After a trip of more than ten years, the time finally comes. A historical moment for astronomy. For the first time, if all goes well, on November 12, 2014 we will be able to land a device on a comet. As if we landed on the tiny planet of The Little Prince. That day, the Rosetta spacecraft of the European Space Agency (ESA) will release the Philae module when it is 22.5 km from the center of the 67P rock / Churiumov Guerasimenko.