Initially people thought that Jupiter had a rocky core. Then in 1997 it was proved that the outer core of Jupiter wasn't rocky but contained metallic hydrogen, that is when hydrogen comes under high temperature and pressure it turns metal. But the pressure should be that of the pressure found in Jupiter's core.
The presence of a core during at least part of Jupiter's history is suggested by models of planetary formation that require the formation of a rocky or icy core massive enough to collect its bulk of hydrogen and helium from the protosolar nebula. Assuming it did exist, it may have shrunk as convection currents of hot liquid metallic hydrogen mixed with the molten core and carried its contents to higher levels in the planetary interior.
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