A solid rocky core could lie below, Bierson said.

比尔森指出，地下可能是坚硬的岩核。

Ceres probably has a rocky core surrounded by a water ice mantle.

谷神星可能有一个岩石内核，被水冻冰块所覆盖。

Bierson said it was possible that contact between water and the rocky core could have created certain chemical ingredients.

比尔森还指出，水和岩核之间的接触可能产生了某些化学成分。

It probably has a rocky core, then a layer of mixed rock and ice above that.

它很可能有一个岩制核，被一层岩石和冰的混合物包裹。

The probes have also made scientists think that under its surface Europa has a rocky core giving off volcanic heat.

科学家们还相信木卫二的岩心是不断散发着热量的火山热源。

Guyon said the usual thinking is that most planets form by the slow growth of solids onto a rocky core.

盖恩表示，通常认为大多数行星是由固体缓慢生长到岩石核心上形成的。

The probes have also made the scientists think that under its surface Europa has a rocky core giving off volcanic heat.

探测器也让科学家们认为木卫二表层有散发出火山热的岩石核心。

There's a small rocky core, smaller than Earth, surrounded by a very thick layer of materials like water, ammonia and methane.

有一个比地球小的岩石内核，外面包围着一层像水、氨和甲烷这样非常厚的物质。

Uranus is an ice giant with a small rocky core and a thick mantle of ammonia, water, and methane.

天王星是一颗冰巨星，有一个小岩石内核和一层由氨、水和甲烷组成的厚厚的地幔。

Like its green brother, it probably has a rocky core surrounded by a thick icy mantle of water, ammonia, and methane.

和它的绿巨人兄弟一样，海王星可能有一个岩石内核，被一层由水、氨和甲烷组成的厚冰层所包围。

Like Jupiter, it probably has a rocky core several times the mass of Earth, surrounded by layers of ice and weird, metallic hydrogen.

就像木星，土星可能有一个比地球质量大几倍的岩石内核，被冰层和奇特的金属氢所包围。

" It could be a rocky core with a light fluffy envelope or a thick atmosphere all the way down to some high-density core, " he said.

" 它可能是一个岩石内核，有一个松软的包裹层，也可能是一个厚厚的大气层，一直延伸到某个高密度内核。"

Today you learned that Uranus and Neptune are ice giants, with small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue.

今天你学到了天王星和海王星是冰巨星，有小的岩石内核，有由氨、水和甲烷组成的地幔，以及使它们看起来呈绿色和蓝色的大气层。

If that were the case, it started out with a rocky metallic core, and once it got big enough it drew in that gas that made it the giant we see today.

如果确实如此，木星就会从一个金属核开始，一旦它变得足够大，就会吸收其它气体，形成今天我们所看到的气态巨行星。

The study theorizes that hot, dense flows of hydrogen, carbon and oxygen thousands of kilometres below the surface of icy giants like Uranus and Neptune could crystallize these diamonds in the planet's rocky core.

这项研究推测，在天王星和海王星等冰巨行星的表面下数千公里处，热而密集的氢、碳和氧气流动可能会使这些钻石在行星的岩石核心结晶。