The planet Jupiter is a massive gaseous body, consisting mainly of hydrogen and helium, which lacks a defined inner surface.
The fact is that the Solar System in formation did not provide enough material for this planet to aspire to more. Because of having managed to attract more matter in its formation, Jupiter would have started a long way as a star body. It would have become a second Sun. If Jupiter had managed to accrete the primordial cloud in which all the planets formed about 13 times its mass, it would have become one of the most enigmatic and evasive celestial bodies: a brown dwarf.

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