Do gas giants have a core? I have always wondered how Jupiter and the other gas giants worked when it came to having a core(If they have one). Would it be rocky or liquid, or can it be a gas. Every time I have asked this question to my teachers I have never gotten an exact answer.
Gas giants are believed to have a solid core. They first formed as icy planets, and were heavy enough to accrete hydrogen and helium from the protoplanetary cloud they were in. 

Saturn, for instance, is thought to have a central dense core of 10  to  25  Earth  masses  that  was  probably  the  seed  of  the  formation  of  the  planet,  before  it  accreted  its  hydrogen-helium  envelope  from  the  protosolar  disk. (see link)