[天] planetary nebula

• 1. 行星状星云: planetary nebula | bipolar planetary nebula | The Rotten Egg Planetary Nebula | Planetarischer Nebel
• 2. 双极行星状星云: bipolar planetary nebula
• 3. 原行星状星云: proto-planetary nebula

更多释义

• 1.行星状星云在数万年间逐渐衰老。
  Planetary nebulae fade away gradually over tens of thousands of years.
  article.yeeyan.org
• 2.l天琴座中的环状星云是最著名的行星状星云。
  L the Ring nebula in Lyra is the best-known of the planetary nebulae.
  article.yeeyan.org
• 3.尽管他当时并不知道，这是首个被记录在册的行星状星云。
  Although he did not know it at the time, this was the first in a class of objects, now known as planetary nebulae, to make it into the catalog.
  article.yeeyan.org

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