I have not read anywhere that she discovered Dark Matter but rather that her observations confirmed its presence as “first proposed by Fritz Zwicky in 1933 but

I have not read anywhere that she discovered Dark Matter but rather that her observations confirmed its presence as “first proposed by Fritz Zwicky in 1933 but rejected by most scientists.” [1] https://www.nsf.gov/news/special_reports/medalofscience50/rubin.jsp https://www.nsf.gov/news/special_reports/medalofscience50/ru...