Starts With A Bang podcast #113 - Weird stars
Briefly

Most stars radiate energy steadily, akin to our Sun, but intrinsic variable stars deviate from this norm, pulsating as they struggle between expansion and contraction, giving new insight into stellar evolution.
Intrinsic variable stars such as Cepheids and RR Lyrae stars exhibit profound characteristics that not only illuminate their own evolution but also serve as key instruments for exploring the vast mysteries of the Universe.
Read at Big Think
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