A
Here’s a concise bullet-point gist for “Jupiter is a failed star”:
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Jupiter’s composition: Mostly hydrogen and helium, like a star.
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Failed star concept: A star forms when its core pressure and temperature are high enough to ignite nuclear fusion.
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Jupiter’s mass: About 1/1000th the mass of the Sun—too low to start fusion.
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Brown dwarf threshold: Objects need ~13 times Jupiter’s mass to fuse deuterium, still much less than a true star.
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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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