Ques : Which American astronomer first proposed that stars are primarily made up of hydrogen and helium?

Ques : Which American astronomer first proposed that stars are primarily made up of hydrogen and helium?

hydrogen helium

Ques : Which American astronomer first proposed that stars are primarily made up of hydrogen and helium?

A. Cecilia Payne-Gaposchkin

B. Annie Jump Cannon

C. Margaret Burbidge

D. Henrietta Swan Leavitt

Ans : A. Cecilia Payne-Gaposchkin

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