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An artist’s depiction of the life of the star system CPD-29 2176. The system began as two large stars (1); a few million years ago one star became a neutron star after a weak supernova (4); in a few million years, the second star will also become a neutron star (6); eventually, the pair will collide and cause a kilonova (9). (Image credit: CTIO/NOIRLab/NSF/AURA/P. Marenfeld )