Earth's Breathing and the Hunt for Gravitational Waves express
A giant musical instrument hides underground. It picks up not sound but the trembling of space itself — gravitational waves from the mergers of dead stars. But this instrument has a problem: it is bothered by Earth's 'breathing.' Winds, storms, even the changing seasons make the ground vibrate, creating noise.
A team of researchers studied how strong this noise is on Sardinia — an island considered as one of the sites for the new gravitational-wave detector, the Einstein Telescope. From 2022 to 2025, they recorded seismic noise in deep boreholes and compared the quietest month (July) with the noisiest (December). The difference turned out to be small. Even in December, when the ocean is stormy, the extra noise reduces the clarity of the signal by just a couple of percent.
This is good news: the detector will be able to operate steadily all year round, without expensive noise suppression systems. The silence of Sardinia's depths proves to be a reliable ally in the hunt for cosmic cataclysms. When the telescope starts working, it will hear even the most distant 'sighs' of the universe — in summer and winter alike.
Gravitational waves from the merger of two neutron stars stretch and squeeze space on Earth by less than the diameter of a proton, so detectors must be incredibly sensitive.
In Carl Sagan's novel 'Contact,' a signal from space also had to be extracted from noise, but there the interference was man-made, not natural.