惑わく星せい状じょう星せい雲うん

noun

planetary nebula

Technical astronomy term for a glowing shell of ionized gas ejected from a red giant star late in its life. Despite the name, it is unrelated to planets.

• 惑わく星せい状じょう星せい雲うんは、恒こう星せいの進しん化かの最さい終しゅう段だん階かいで形けい成せいされる。

  Planetary nebulae are formed in the final stages of stellar evolution.

• この望ぼう遠えん鏡きょうで、いくつかの惑わく星せい状じょう星せい雲うんを観かん測そくできる。

  With this telescope, you can observe several planetary nebulae.