planetary nebula [天] 行星状星云
bipolar planetary nebula 双极行星状星云 ; 行星状星云
proto-planetary nebula 原行星状星云 ; 原始行星状星云
The Rotten Egg Planetary Nebula 行星状星云
pre-planetary nebula 前行星状星云
bipolar r planetary nebula 双极行星状星云
Planetary nebula luminosity function 行星状星云亮度函数
Such stars eventually blow off the material of their outer layers, which creates an expanding shell of gas called a planetary nebula.
这样的恒星最终炸开了它们的外层物质,形成了向外扩展的气体盔甲,名为行星状星云。
Hence, it is rare that an open cluster survives long enough for one of its members to form a planetary nebula.
因此,一个疏散星团很少能够存活到它内部的某个成员变成行星状星云。
The hot core collapses and begins to pulsate, eventually shedding its outer layers of gas to set the stage for the birth of a planetary nebula.
恒星高温的核心坍缩,并开始有规律的振动,最终气体外层迸散,为行星星云的形成提供了有利条件。
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