Gravitational Waves
Astronomers have uncovered evidence that a black hole and neutron star merged while following an unusual oval-shaped orbit, challenging expectations of circular paths in such events. The discovery comes from a reanalysis of gravitational wave data from the event known as GW200105. This finding suggests the system formed in a dynamic stellar environment.
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Researchers from the University of Illinois Urbana-Champaign and the University of Chicago have developed a novel approach to calculate the Hubble constant using gravitational waves from black hole collisions. This technique, known as the stochastic siren method, analyzes the background hum of faint mergers to potentially resolve the Hubble tension. The findings, accepted for publication in Physical Review Letters, offer improved precision with current data.
Astronomers detected the strongest black hole collision yet on September 11, 2025, resonating with Einstein's predictions. The event involved massive black holes merging, producing significant gravitational waves. This finding was published in a leading science journal, advancing astrophysics.