protoplanetary nebula
past participle of blow one's top
simple past tense and past participle of end in
(mathematics) of, relating to, or being an injection: such that each element of the image (or range) is associated with at most one element of the preimage (or domain); inverse-deterministic
(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.
天文学者たちは、老いた恒星が真の惑星状星雲になる前に外層を放出し始める段階である前惑星状星雲の鮮明な画像を撮影した。
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