Question: SN 1939C was a supernova in the Fireworks Galaxy first discovered on 17 July 1939, by which Swiss astronomer, who worked most of his life at the California Institute of Technology?
Sentence (from "Fritz Zwicky"): In 1933, Zwicky was the first to use the virial theorem to infer the existence of unseen dark matter, describing it as ""dunkle Materie "".
Relevant evidence: No