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Although most gravitational wave events are claimed to be mergers ofunusually massive, $25-65M_\odot$, black holes, it is now clear that 20\% ofall reported events comprise modest mass black holes, $5-15M_\odot$, like thestellar black holes in the Milky Way. We show that such stellar mass black holebinaries (BBH) if magnified by lensing galaxies can be detected at highredshift, 1$< $z$ <$5, with chirp masses increased by $1+z$, accounting for themajority of apparently high mass BBH events. This simple lensing explanation ismanifested by the evident bimodality of BBH chirp masses now visible, with 80\%of BBH events in a broad peak centered on $m_{chirp} \simeq 35M_\odot$, and20\% of BBH events in a narrow, low mass peak at $m_{chirp} \simeq 8.5M_\odot$,matching well our prediction for lensed and unlensed events respectively. Thislensing interpretation is reinforced by the "graveyard plot" when ranked bychirp mass, revealing a jump in chirp mass at $m_{chirp} \simeq 10M_\odot$ thatwe show is caused by the large redshift difference between unlensed events with$z<0.3$ and lensed events above $z>1$. Furthermore, nearly all BBH events areseen to share a component mass ratio of $m_1/m_2=1.45\pm0.03$, indicating acommon stellar origin for BBH events across all chirp masses. This observedcomponent mass uniformity implies most binary black holes seldom pair up byrandom capture, instead we may conclude that massive progenitor stars of BBHblack holes typically formed in-situ, in a well defined way over the full spanof cosmic time accessed through gravitational lensing.

A uniform stellar origin for binary black holes revealed by lensing