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Loading contentGravitational-wave sources whose distance can be read directly from the shape of the waveform, with no calibration ladder at all — the gravitational analogue of a standard candle. A merging neutron-star pair with an electromagnetic counterpart yielded the first standard-siren measurement of the Hubble constant.
Facts on this topic will be cited from these primary and reference sources.
Direct detections of gravitational waves from compact-object mergers.