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Abstract Ozone is a very minor atmospheric gas that protects life on Earth from the Sun's harmful ultraviolet rays. Its concentration is highest in the ozone layer located between 15 and 35 km above the Earth's surface. The fragile balance of ozone has …

Abstract Although atmospheric composition has varied over very long time scales, today's atmosphere is essentially made up of nitrogen ( N2 ) and oxygen ( O2 ). The impact of human activity on the concentration of these gases is measurable but negligible. …

This lecture, moved to 3 rue d'Ulm, has not been recorded. Abstract We continue our study of large random regular graphs by describing their diameters. We also prove B. Bollobás' theorem : the number of closed geodesics of given length on such a graph …

Guillaume Cuchet: "Recent trends in French Catholicism" Vincent Tiberj: "The muslims next door: the diversity of a religious minority" …

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Abstract We present i) a necessary and sufficient condition of optimality for transport and ii) a regularization of Wasserstein distances. …

Abstract This seminar will explore in detail the physical properties of Jupiter's Trojans. It will present NASA's LUCY mission, launched in 2021, which will encounter five Trojan objects between 2027 and 2033. We will also discuss the exciting discovery …

One-hour lecture , followed by the seminar. Abstract After a brief introduction to the properties of the giant planets, we'll describe their satellite populations, focusing on the so-called "   irregular   " satellites due to their eccentric and inclined …

Abstract The increase in atmospheric CO2 concentration is the main cause of the global warming observed over the last fifty   years. However, the quantities of fossil carbon extracted from the subsoil and injected into the atmosphere are small compared …

Abstract The aim of this year's lecture is to describe random hyperbolic surfaces, their geometry and spectrum. We will also discuss random regular graphs, whose combinatorics and spectral theory are in many ways analogous to those of hyperbolic surfaces. …

Abstract On the occasion of the exhibition "   Feuilleter Notre-Dame  : chefs-d'œuvre de la bibliothèque médiévale   ", organized at the Musée de Cluny by the BnF, the session will bring together specialists in Notre-Dame manuscripts and archives. It will …

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Abstract Comets are classified into two main families according to their orbital properties : comets of the Jupiter family and comets with an isotropic distribution. The former come from the Kuiper belt, more precisely from its sub-component known as the …

Dante's Boat , Eugène Delacroix, 1822 Mikael Larsson is invited by the Collège de France assembly at the suggestion of Prof. Thomas Römer. Prof.   Larrson will speak in English, with a lecture in French. Abstract Danish director Lars von Trier is a …