The Webb Telescope, the next flagship astrophisical mission from NASA, ESA and the CSA, will be launch on December 18th 2021. With a 6.5 m primary mirror, it harbors 4 state-of-the-art instruments with powerful spectroscopic, imaging and coronagraphic capabilities. During Cycle 1 more than 10000 hours of observing time have been allocated to 400 programs and over 2500 worldwide researchers. From the epoch of reinonization and the evolution of galaxies, to studies of the interestellar medium, evolved stars, debris disks and planetary atmospheres, nearly every area of astrophysics and planetary astronomy are already represented in the first year of observations. This contribution will explore Webb's main areas of studies in Cycle 1, that will certainly open a new space for astrophysical discovery.