preplanetary nebula
plural of Stamp
simple past tense and past participle of declutter
(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.
So as to emulate.
研究チームは赤外線分光器を用いて前惑星状星雲を調査し、星が本当の惑星状星雲になる前に外層を放出し始める様子を明らかにした。
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