NAUTILUS

At the Frascati Laboratories, NAUTILUS, a gravitational wave detector consisting of a 2.3 ton resonant bar at a temperature of only 0.13 degrees above absolute zero, has been in operation since 1995. The detector was designed to detect gravitational waves emitted by high-frequency sources (around 1 kHz), such as gravitational collapses with the formation of neutron stars or blacks holes.