
100 years ago, Cecilia Payne discovered what the stars are made | By Ethan Siegel | Start with an explosion! | APR, 2025
This image shows the core of the Terzan 5 globular cluster, only 22,000 light years away in our own Milky Way, with a wide variety of colors and masses inherent in the stars. With millions of stars in just a few tens of light years on each other, this dense collection of stars remains incredibly…