Thank you Sidney Van Den Bergh for correctly translating Zwicky's “dunkle (kalte) materie” as “dark (cold) matter” and finally putting to rest the myth that Zwicky called it “missing matter.”Thank you Sidney Van Den Bergh for correctly translating Zwicky's “dunkle (kalte) materie” as “dark (cold) matter” and finally putting to rest the myth that Zwicky called it “missing matter.”