List of black holes list of black holes black hole . Messier and New General Catalogue designations are given where possible., 10 mergers of binary black holes have been observed. In each case two black holes merged to a larger black hole. In addition, one neutron star merger has been observed, forming a black hole. In addition, over 30 alerts have been issued since April 2019 , of black hole merger candidates.Multiple black hole systems Binary black holes In addition, the signal of several binary black holes merging into a single black hole and in so doing producing gravitational waves have been observed by the LIGO instrument. These are listed above in the section Black holes detected by gravitational wave signals.Trinary black holes As of 2014, there are 5 triple black hole systems known. SDSS J150243.09+111557.3 core black holes — the three components are distant tertiary J1502P, and the close binary pair J1502S composed of J1502SE and J1502SW GOODS J123652.77+621354.7 core black holes of triple-clump galaxy 2MASX J10270057+1749001 core black holes
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