rocky core meaning in English

岩核

Dr marcy suspects that his new discovery , which has about 45 times the mass of the earth , is composed of a rocky core surrounded by a thick envelope of hydrogen and helium gas
马西博士怀疑，他的这个拥有地球质量四十五倍的新发现星体有一个岩层核心构成，并被一层很厚实的氢气与氦气层笼罩。
Neptune is similar to uranus in many ways , it has a rocky core , a ring system , many satellites , a magnetic field , etc . however , it seems to be more dynamic ; its surface has a
海王星和天王星有不少相似的地方，它亦拥有岩石核心光环众多卫星和磁场等等。但是海王星的大气看来比天王星的活跃，表面有称为