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At the edge of our solar system supposedly lies an immense planet. Five to ten times the size of the Earth. Several international teams of scientists have been competing in a frantic race to detect it, in uncharted territories, far beyond Neptune. The recent discovery of several dwarf planets, with intriguing trajectories, have put astronomers on the trail of this mysterious planet. Why is this enigmatic planet so difficult to detect? What would a ninth planet teach us about our corner of the universe? Could it help us unlock some of the mysteries of our solar system?

Several hundred million kilometers away, the space probe "Rosetta" and the small lander "Philae" orbit the sun on the comet "Churyumov-Gerasimenko", without any contact with Earth. On September 30, 2016 - two years after the launch of "Philae" - the landing of "Rosetta" on the comet marked the end of a space mission rich in discoveries, successes and setbacks. The documentary "Rendezvous with a comet: Mission Rosetta" revisits this extraordinary space adventure. After the landing of "Philae" on the comet "Churi" in November 2014 - probably one of the greatest successes in space research since the moon landing - the mission continued and provided a whole series of surprises.

For several decades, geoscientists have been observing that the Earth is changing rapidly due to human intervention. This action has such a great impact on the biological, geological and atmospheric processes of the Earth that some scientists speak of the dawn of a new epoch: the Age of Man or the Anthropocene.

Albert Einstein's theory of general relativity has revolutionised our understanding of gravity, space and time. Initially acclaimed, then forgotten, and now rediscovered, the adventure of this hundred-year-old theory has marked the scientific history of the 20th century. From its inception, a mathematical difficulty arose that could have nipped the theory in the bud: the Schwarzschild singularity. In the company of great international relativistic physicists, the viewer embarks on a discovery of this theory with a singular destiny. We discover a "curved" universe that proves to be even stranger than Einstein had envisioned, and harbours some objects - such as black holes - that still challenge today's scientists.

It was November 12, 2014, at 5:03pm. Humanity had just accomplished a feat that will forever mark its history. Philae, the miniature laboratory integrated into the Rosetta probe, landed softly on comet 67P Chourioumov-Guérassimenko, better known as Tchouri. The culmination of a project decided twenty-one years earlier, in 1993, by the European Space Agency - the first to display the immense ambition of landing on one of these bodies made of ice and dust, archives of the solar system's infancy. To achieve this, it took years of preparation, a decade-long flight, six billion kilometers flown, thousands of scientists and engineers involved... Astrophysicist Anny-Chantal Levasseur-Regourd sums it all up: "From this mission, we hope - and can reasonably expect - to understand the origin of the solar system and how life appeared on Earth.