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January 11, 2011 Tuesdays at the Espace des sciences with Jean-Pierre Luminet, Astrophysicist at the Univers & Théories Laboratory of the Paris Observatory - Meudon, Research Director at the CNRS, writer. What is the shape of the universe? Is it finite or infinite, continuous or discontinuous, smooth or crumpled? Is it pierced by black holes and wormholes connecting it to other universes, does it have hidden dimensions? What if it were smaller than expected? What if large-scale mirages gave us the illusion of a universe larger than it actually is, creating several "ghost" images of the same galaxy? In October 2003, the prestigious journal Nature published on its front page an article by J.-P Luminet that caused a sensation: according to the latest observational data on the vibrations of the primordial universe, cosmic space would have the shape of a spherical dodecahedron, whose volume would represent only 80% of that of observed space. The conference will be illustrated by film extracts and spectacular animations from computer simulations.