暗あん黒こく星せい雲うん

noun

dark nebula

Astronomical term for a dense interstellar cloud that obscures light from background stars.

• 暗あん黒こく星せい雲うんは、背はい後ごの星ほしの光ひかりを遮さえぎって黒くろく見みえる。

  A dark nebula appears dark because it blocks the light from stars behind it.