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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Coreless planet ： ウィキペディア英語版 Coreless planet A coreless planet is a theoretical type of terrestrial planet that has no metallic core, i.e. the planet is effectively a giant rocky mantle. Despite the name this is not the same as a hollow earth. ==Origin== According to a 2008 paper by Sara Seager and Linda Elkins-Tanton, there are probably two ways in which a coreless planet may form. In the first, the planet accretes from chondrite-like fully oxidized water-rich material, where all the metallic iron is bound into silicate mineral crystals. Such planets may form in cooler regions farther from the central star. In the second, the planet accretes from both water-rich and iron metal-rich material. However, the metal iron reacts with water to form iron oxide and release hydrogen before differentiation of a metal core has taken place. Provided the iron droplets are well mixed and small enough (<1 centimeter), the predicted end result is that the iron is oxidized and trapped in the mantle, unable to form a core. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coreless planet」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.