We explore how researchers are using the stochastic gravitational-wave background—the ‘hum’ from countless unresolved black-hole mergers—as a gravity-only ruler to probe cosmic expansion. No loud events required: the current silence in the gravitational-wave background places tight constraints on slow-expansion scenarios and nudges us toward the higher Hubble constant. With LIGO, Virgo, and KAGRA, a definitive detection could arrive within six years, marking a new era in gravitational cosmology.

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