2025 in outer space

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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 overtone of the Kerr solution for a rotating black hole. The findings were corroborated in a September 2025 scientific article.