The Black Hole Mapper reaches a milestone with its first southern hemisphere optical observations, coordinated eROSITA X-ray identification, and multi-epoch tracking of accreting black holes across the universe. APACHE POINT OBSERVATORY, NM & LAS CAMPANAS OBSERVATORY, CHILE — The Sloan Digital Sky Survey (SDSS) announces Data Release 20 (DR20) , marking a landmark expansion in the study of accreting supermassive black holes (SMBHs). As part of the fifth generation of the survey (SDSS-V), the Black Hole Mapper (BHM) program is providing unprecedented insights into the masses, growth, and physics of quasars and active galactic nuclei (AGN) across cosmic time. Sky distribution of DR20 astronomical objects targeted by the Black Hole Mapper (BHM) program in SDSS-V.…