"Black Hole Collisions: Gravitational Waves Reveal Preferred Masses"

A new study of gravitational-wave events suggests that black holes have a preference for forming around two specific masses, approximately nine and 16 times the mass of our sun. This finding sheds light on the physics of massive stars and could provide a new way to measure the expansion rate of the universe, known as the Hubble constant. By analyzing the frequency of gravitational-wave chirps, scientists may be able to decouple black hole masses from redshift, allowing for an independent measurement of the Hubble constant. A new observing run involving LIGO, Virgo, and KAGRA aims to discover more gravitational-wave events and further validate these findings.