To understand how we classify and differentiate the stars we see in the sky, we first need to understand how they are born and change throughout their lives. Star formation begins with a massive cloud ...

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By relating the spectral lines to the temperatures and abundances of elements in stars, Payne-Gaposchkin refined and explained temperature estimates for the different classifications of stars, for ...

From 19th-century glass plates to today’s high-resolution spectrographs, astronomers have developed ingenious ways to measure a star’s temperature, brightness, and chemical makeup. These measurements ...