le 4 septembre 2026, 10h45 à 12h45, Katia Ferrière, salle Jules Verne, OMP, site Belin Summary: I will take you on a cosmic journey from the Earth to the far reaches of the observable Universe. We will first spend some time in the solar system, where I will show how the radius of the Earth […]
le 11 septembre 2026, 10h45 à 12h45, Arturo Lopez-Ariste, salle Coriolis, OMP, site Belin Summary: The phase of a wave can only be defined unambiguously for complex waves. This strange quantity appears at the core of all physics: from the quantification of atomic levels or of the electric charge to the source of the electromagnetic […]
le 18 septembre 2026, 10h45 à 12h45, Natalie Webb, salle Jules Verne, OMP, site Belin Summary: Thanks to large surveys such as those carried out with Gaia, Pan-STARRS, the Sloan Digital Sky Survey (SDSS), 2MASS, NVSS, XMM-Newton and Chandra, we have catalogued many stars and galaxies, as well as exotic objects, especially when we observe […]
le 25 septembre 2026, 10h45 à 12h45, Aurélie Astoul, salle Jules Verne, OMP, site Belin Summary: On Earth, tides are well-known to cause the ebb and flow of seas and oceans. This phenomenon is due to the gravitational action of the Moon and Sun on large volumes of terrestrial fluids. In our Solar system, tidal […]
Le 2 octobre 2026, Luigi Tibaldo, 11h45 à 12h45, Salle Jules Verne, OMP, site Belin Summary: The fundamental laws of physics known to date suggest that equal amounts of matter and antimatter should have been produced, and annihilated, during the Big Bang. Yet, cosmic-ray measurements and gamma-ray observations show that antimatter is present at most […]
Le 2 octobre 2026, Luigi Tibaldo, 10h45 à 11h45, Salle Jules Verne, OMP, site Belin Summary: Cosmic rays are energetic particles first observed around the Earth with energies ranging from MeV to above 10^20 eV and with approximately isotropic arrival directions. A most remarkable change of the cosmic-ray spectrum occurs around 10^15 eV. Below this […]
Le 9 octobre 2026, Victor Réville, 10h45 à 12h45, Salle Jules Verne, OMP, site Belin Summary: Magnetic reconnection is a fundamental process in astrophysics. It allows converting magnetic into thermal and kinetic energy in astrophysical plasmas. In the solar atmosphere, it has been associated with solar storms, flares, and the release of energetic particles and […]
Le 5 décembre 2025, à 10h45, par François Olchewsky et Claire Moutou, en salle Jules Verne, site Belin, OMP. Résumé : Pour étudier le champ magnétique des étoiles, découvrir les planètes autour des étoiles froides et rouges, et caractériser leurs atmosphères, l’instrument SPIP a été conçu, réalisé, et bientot mis en place au Télescope Bernard […]
Le 26 septembre 2025, Alain Blanchard, 10h45 à 12h45, Salle Jules Verne, OMP, site Belin Summary: Over the course of the twentieth century, cosmology revealed the presence of an unknown form of matter, undetectable on Earth or in laboratories: dark matter, which in fact constitutes the main material component of the Universe. But over the […]