THE SIMONS OBSERVATORY
Résumé
We describe the new generation CMB-polarization instrument, the SimonsObservatory, which will start observing the sky in 2021 from the 5,200 m-highChajnantor plateau in the Atacama desert, Chile. The observatory willcharacterize with high accuracy the CMB intensity and polarization fluctuations,aiming at a broad range of science targets, from the early to the late Universe.We will review these science objectives, as well as the instrumentalconfigurations adopted by the collaboration, as it was presented during the 53rd Rencontres de Moriond, in La Thuile, in March 2018.