Euclid: Probing the Dark Sides of the Universe

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 past twenty years, an even more profound shift has taken place: the dominant component of the Universe appears to be in the form of “dark energy,” whose nature and origin remain entirely unknown to current physics—posing one of the greatest challenges to fundamental science in the 21st century. The Euclid mission, a European satellite project, will provide an unprecedented wealth of astronomical data, helping to better understand the properties of the dark components of our Universe.