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" ... A still image of a visualization of the merging black holes that LIGO and Virgo have observed so... [+] far. As the horizons of the black holes spiral together and merge, the emitted gravitational waves become louder (larger amplitude) and higher pitched (higher in frequency). The black holes that merge range from 7.6 solar masses up to 50.6 solar masses, with about 5% of the total mass lost during each merger. The frequency of the wave is affected by the expansion of the Universe. ... "
" ... But in 2017, something spectacular happened that blew all our other constraints — both direct and indirect ones — away. From ~130 million light-years away, a gravitational wave signal began to arrive. It started out with a small but detectable amplitude, then increased in power while getting faster in frequency, corresponding to two low-mass objects, neutron stars, inspiraling and merging. After only a few seconds, the gravitational wave signal spiked, and then ceased, signaling the merger was complete. And then, no more than 2 seconds later, the first sign of light arrived: a gamma-ray burst. ... "
" ... The brightness distance relationship, and how the flux from a light source falls off as one over the... [+] distance squared. Gravitational waves emitted from a point spread out the same way in terms of energy, but their amplitude falls off only linearly with the distance, rather than as the distance squared like energy does. ... "
" ... We see gravitational waves with the precise frequency and amplitude that Einstein’s theory predicts for merging black holes and inspiraling neutron stars. ... "
" ... When two compact masses merge, such as neutron stars or black holes, they produce gravitational... [+] waves. The amplitude of the wave signals are proportional to the black hole masses. LIGO and Virgo, combined, may finally be sensitive to black hole masses below the traditional mass gap threshold. If the preliminary observations hold up, there will be a mass gap no longer. ... "