The Vera C. Rubin Observatory project will conduct a 10-year Legacy Survey of Space and Time (LSST) with its 8.4 meters telescope, currently under construction in Chile.  This international effort, supported in France by CNRS, will aim to produce the deepest and widest picture of the Universe yet by surveying the entire southern night sky once every few days, at a rate of about 20 Terabytes of data every night! In total LSST is expected to image up to 37 billion stars and galaxies.

The LSST Dark Energy Science Collaboration (DESC) is one of several international Science Collaborations tasked with analyzing this vast amount of data to answer fundamental questions in Cosmology, including the nature of Dark Energy.  One of the promising probes that DESC has at its disposal to reach that goal is the Weak Gravitational Lensing effect, and this is where members of the CosmoStat team are the most involved in DESC.