French National Centre for Space Studies president Jean-Yves Le Gall (left), French President Francois Hollande (centre) and former French astronaut Claudie Haignere follow the successful landing of the Philae lander on comet 67P/Churyumov-Gerasimenko at the Cite des Sciences at La Villette in Paris on November 12. The European Space Agency landed a probe on a comet, a first in space exploration and the climax of a decade-long mission to get samples from what are the remnants of the birth of Earth's solar system