Black Holes Studied as a Population May 7, 2021• Physics 14, 67 The latest dataset from gravitational-wave observatories has enough events to allow researchers to study properties of the whole population of black holes. F. Elavsky and A. Geller/Northwestern Univ./LIGO-Virgo Collaboration Black holes (blue), neutron stars (orange), and compact objects of uncertain nature (gray) detected via gravitational waves through September 2019. Each binary merger involves three compact objects: the two coalescing objects and the final remnant. The vertical scale is in solar masses.Black holes (blue), neutron stars (orange), and compact objects of uncertain nature (gray) detected via gravitational waves through September 2019. Each binary merger involves three compact objects: the two coalescing objects and the final remnant. T... Show more