Four new gravitational waves detected

• Scientists have made four new detections of gravitational waves emanating from separate black hole mergers.
• The gravitational waves were detected by the US-based LIGO and Europe-based VIRGO gravitational-wave detectors.
• The new waves are known as ‘GW170729’, ‘GW170809’, ‘GW170818’, and ‘GW170823’, in reference to the dates they were detected.

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