planetary nebula
(biochemistry) Any metabolite that contains a phosphate (or similar) group
(astronomy) A nebulosity surrounding a dying red giant, consisting of material expelled by the star.
(geology) A tectonic plate convergent boundary in Micronesia
comparative form of prissy: more prissy
天文学者たちは、消えつつある惑星状星雲を研究して、死にゆく恒星がどのように星間物質を豊かにするかを調べた。
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