Gravitational waves from nearby pulsars could be detected using just a few kilograms of superfluid helium-4, according to physicists in the US. Their detector, which is yet to be built, would measure sound waves in the superfluid caused by gravitational waves in the 0.1–1.5 kHz range.
Gravitational waves are ripples in space–time that are created when massive objects are accelerated under certain conditions. The first gravitational-wave detection was made in 2015, when the LIGO observatory spotted a signal from a coalescing binary black hole. Two more gravitational waves have since been detected by LIGO, both associated with binary black holes.
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