Is Jupiter truly a failed star?

Jupiter is sometimes called a “failed star” because it has the same ingredients as the Sun: mostly hydrogen and helium. But the truth is, Jupiter never had enough mass to ignite nuclear fusion—the process that makes stars shine. To become a star, Jupiter would need to be about 70–80 times more massive than it is now. Instead, it remains the largest planet in our Solar System, with powerful storms, dozens of moons, and a magnetic field stronger than any other planet.

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