Monday, 24 November 2025

JUPITER IS A FAILED STAR

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Here’s a concise bullet-point gist for “Jupiter is a failed star”:

  • Jupiter’s composition: Mostly hydrogen and helium, like a star.

  • Failed star concept: A star forms when its core pressure and temperature are high enough to ignite nuclear fusion.

  • Jupiter’s mass: About 1/1000th the mass of the Sun—too low to start fusion.

  • Brown dwarf threshold: Objects need ~13 times Jupiter’s mass to fuse deuterium, still much less than a true star.

  • Conclusion: Jupiter is often called a “failed star” because it has star-like material but lacks the mass to become a star.

If you want, I can make an ultra-short 1-line version for memory or notes. Do you want me to do that?

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