What are stars made of? A century ago, this woman found out—and changed physics forever

Click Here to Read: What are stars made of? A century ago, this woman found out—and changed physics forever
In 1925, grad student Cecilia Payne first proposed that stars were mostly made of hydrogen and helium and shaped our understanding of the universe By Liz Kruesi on the National Geographic website on January 1, 2025.

This image, taken by the NASA/ESA Hubble Space Telescope, shows the colorful death of a star similar to our sun.  Image: NASA  ESA, and K. Noll (STScI)  Public Domain via Wikimedia Commons.

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