Red Giants

Red giants are huge stars, roughly 70 times as large as the Earth's Sun, yet with a helium core only a few times larger than the Earth, or about 1/10,000 the size of the star. With the lack of nuclear fusion in the core, the gas pressures allow gravitational forces to compress the helium to high densities, such that about 25 percent of the star's mass exists within the core, and the density rises to about 1,000,000,000 kg per cubic meter. strong stellar winds in this stage blow away a significant part of the star's mass, typically 20-30 percent of the original mass.

Continue reading here: Helium Fusion Stage

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