Shortly Before They Collided, two Black Holes Tangled Spacetime up Into Knots universetoday storybywill
Binary black holes are considered a prime candidate for researching GWs since astronomers expect some will consist of precessing binaries. In this scenario, black holes will circle each other in ever-tightening orbits, generating an increasingly strong GW signal until they merge. However, no definitive evidence of orbital precession has been observed from the 84 BBH systems detected by Advanced LIGO and Virgo so far.
Previously, the fastest-known example was a binary pulsar that took over 75 years for the orbit to process. In this case, the BBH known as GW200129 processes several times a second, an effect 10 billion times as strong as the binary pulsar. Even so, confirming that the black holes in this system were precessing was a significant challenge. Said Dr.
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