With 2 large interferometers, Virgo, and GEO (located near Hannover) and three cryogenic (below liquid Helium temperature) resonant antennas located at CERN, Frascati and Legnaro, Europe is at the forefront of research on gravitational waves.

More than 20 laboratories and a few hundred researchers in 6 European countries are already involved in experimental developments aiming at gravitational waves detection. A large number of theoretical physicists and astrophysicists are also involved in the prediction of gravitational waves sources characteristics and in the analysis of experimental data.
Future resonant detectors may use spheres instead of bars. They could usefully complement the network of interferometers.