GW250114 was a black hole merger detected by LIGO on January 14, 2025. It generated the clearest gravitational wave signal received to date, with a signal-to-noise ratio (SNR) of about 77-80, far clearer than the 42 SNR of the previous best gravitational wave observation (of GW230814). It identified (with a 4.1‍σ level of significance) the first...