Post #1711447
2026-03-11 20:52 UTC
@sposadelvento @VoiceofDuum No. In about 5 billion years the sun's core supply of H will have been mostly converted to He via nuclear fusion that currently provides us with energy, & then the sun will expand to become a red giant with its surface just inside the Earth's orbit. At that point the core will engage in a He -> C fusion reaction. After a few hundred million years the core will be choked up with C and then it will collapse to become a white dwarf star. 1/3 #astronomicalTruths
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@TreeStarMan@mastodon.social 2026-03-11 21:09
@sposadelvento @VoiceofDuum The most important determinant of stellar evolution is stellar mass. Massive blue stars run through fusion reactions up to Fe & then explode in supernovae, & the whole process takes just a few million years. Fe is the energy well of the universe. Fusion of lighter elements yields energy, while fission of heavier ones yields energy. Tiny red dwarfs don't reach the He -> C stage, but take hundreds of billions of years to become white dwarfs. 2/3 #astronomicalTruths