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📖 Chapter 1 of 6 · How the Sun Says Goodbye · All ages

The Sun runs low on fuel

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Right now the Sun is happily burning hydrogen in its core, the way it has for about 4.6 billion years. But in around 5 billion years, the hydrogen fuel in its core will start running out.

When that happens, the Sun's core shrinks and heats up, and its outer layers start to puff outward. This is the beginning of the Sun becoming a red giant.

STAGE 2

All chapters in How the Sun Says Goodbye

  1. The Sun runs low on fuel
  2. The Sun swells into a red giant
  3. The far planets are left alone
  4. A gentle puff, not a blast
  5. What's left: a white dwarf
  6. Cooling into a black dwarf