helium-rich core
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Helium Ignition in Stars
When I first began learning about stars, I expected them to be violent and chaotic places. And to an extent, they certainly are. Pressures are unbelievably high in their cores — high enough to smash protons together, and this is…
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How a Star Expands
Meet Betelgeuse, a bright star in the winter constellation Orion. Betelgeuse is a cool red supergiant that we’ll talk about a lot more in just a couple weeks, when we cover variable stars. Not too long ago, it was the…
