After the first detection of gravitational waves in 2015 and the GW170817 multi-messenger observation, gravitational wave astronomy has evolved rapidly. The LIGO and Virgo detectors conducted their third observing campaign between April 2019 and March 2020, and the third catalog of gravitational wave sources (GWTC-3) was published in late 2021, with a total of 90 sources detected to date. New observing campaigns are planned in 2023 (O4) and 2026 (O5) by the LIGO-Virgo-KAGRA network. New upgrades of LIGO and Virgo are planned for 2030, allowing to reach the limits of the current infrastructures. The European Einstein Telescope project, recently inserted in the European Roadmap (ESFRI) and the American Cosmic Explorer project, both planned in new and larger infrastructures, will further increase the scientific potential of gravitational wave astronomy. In this seminar, after a summary of current gravitational wave observations, I will describe in detail the LIGO-Virgo-KAGRA plans for the decade 2020, followed by the science goals and plans for the Einstein Telescope and Cosmic Explorer.
