Bayan shekaru da yawa na farin ciki, a cikin Yuli 1909 Marie Planck ya mutu, mai yiwuwa daga tarin fuka. A watan Maris 1911 Planck ya auri matarsa ta biyu, Marga von Hoesslin (1882<unk>1948); a watan Disamba an haifi ɗansa na biyar Hermann. Tambaya: Me Marie Planck ya mutu?
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