单词planetary nebula
un.: 行星状星云
网络: 行星星云；行星状星云或星状星云
行星状星云
It is one of the best examples of a planetary nebula and a favorite target of amateur astronomers.
它是行星状星云的最好范例之一，也是业余天文爱好者最喜欢观测的目标之一。
So most people, you know, kind of have no idea of the difference between like, an emission nebula and a planetary nebula.
这和实际的频率和规模几乎是一样的。大多数人都分不清发射星云和环状星云之间的区别。
Explanation: The sands of time are running out for the central star of this hourglass-shaped planetary nebula.
说明：在这个沙漏状的行星状星云中，时间之砂正从中央的恒星之中流失殆尽。
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。
Our own sun will blossom into a planetary nebula when it dies in about five billion years.
大约50亿年后，我们的太阳死去时，也会变成行星状星云。
The spectacular planetary nebula Helix Nebula is the death of a star disguised as a butterfly.
色彩斑斓的行星状星云螺旋星云，正是恒星死亡所化身的蝴蝶。
It will evolve into a cosmic butterfly - a spectacular planetary nebula in the starry sky .
不过，太阳的死亡绝不平淡，它会化为星空蝴蝶成为夜空中灿烂的行星状星云。
The result is called, somewhat misleadingly, a planetary nebula.
这个结果称为行星状星云，这是个常让人误解的名字。
The Helix Nebula is the closest example of a planetary nebula created at the end of the life of a Sun-like star.
螺旋星云是离我们最近的例子，它形成在一颗像太阳一样的星星消亡的时候。
The central planetary nebula nucleus (PNN) or white dwarf central star is the fainter of these two stars.
行星状星云核心的中心可能是一颗比这两颗恒星更暗淡的白矮星。