In red-giant stars with mass more than 1.5 times, but less than 3 times, Sun mass, helium nuclear fusion to carbon at 10^8 K causes explosion. Stars {Cepheid variable star} {yellow supergiant} have a carbon center, helium layer, hydrogen-fusion layer, and hydrogen layer. Old stars in globular clusters and galactic nuclei are Cepheid variables {type-two Cepheid variable}.
Physical Sciences>Astronomy>Star>Kinds
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Date Modified: 2022.0224