“Dumbbell Nebula”的概念、定义、翻译、参考文献-科学参考

单词	Dumbbell Nebula
释义	Dumbbell Nebula [`dǝm´bel `neb·yǝ·lǝ] ^ASTRONOMY A planetary nebula of large apparent diameter and low surface brightness in the constellation Vulpecula, about 220 parsecs (4.2 × 10¹⁵ miles or 6.8 × 10¹⁵ miles or 6.8 × 10¹⁵ kilometers) away.
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