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JV
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Would it be possible for a planet by collecting gas to become a star. I mean if it were to collect enough hydrogen, the temperature and the pressure at the surface of the planet could get high enough to start fusion ?
Yes, it is possible for a planet to become a star, although it is a rare occurrence.
A planet can become a star through a process called stellar accretion, where it gains enough mass to ignite nuclear fusion in its core, becoming a burning star.
The minimum mass required for a planet to become a star is about 13 times the mass of Jupiter, or 0.08 times the mass of the Sun.
No, not every planet has the potential to become a star. It needs to have enough mass and the right conditions for nuclear fusion to occur in its core.
If a planet in a solar system becomes a star, the other planets will continue to orbit around it, just as they did when it was a planet. However, they may experience changes in their orbits due to the increased gravitational pull of the new star.