She found out what stars are made of, but was 'ignored' for 101 years.
Cecilia Payne-Gaposchkin, who discovered stars are made of hydrogen and helium, got a blue plaque 101 years later. Her 1925 Harvard thesis challenged beliefs, saying, "stars are made overwhelmingly of hydrogen and helium." This changed astronomy, and she became Harvard's first female astronomy PhD and professor.






