最終更新日：2024/07/29
(astronomy) A rotating disk of dense gas and dust surrounding a young newly formed star, and from which planets may be formed.
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protoplanetary disk
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(astronomy) A rotating disk of dense gas and dust surrounding a young newly formed star, and from which planets may be formed.
protoplanetary disk
DiQt（ディクト）
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★★★★★★★★★★
