Comments on Ligo -Virgo Gravitational Waves Observations

Many gravitation waves (GW) events have been detected from 2016 up to 2020 by the Laser Interferometer Gravitational-Wave Observatories (Ligo -Virgo). Ten emitting systems are formed by black-hole binaries and one by neutron star binary. In this paper we remember that besides binary systems there are many different emitting astronomical systems that could also be detected. These are, for instance, neutron star pulsations, wobbling of deformed neutron stars and cataclysmic supernovae. Key words: GW detection; astronomical GW emitting systems.