dark nebula

短语

词形变化

dark nebulae dark nebulas 复数 dark nebulas dark nebulae 复数

释义与例句

n.
  1. 1.

    A type of nebula that does not emit or reflect (visible) light, and thus obscures light sources behind it.

    天文

    The Horsehead Nebula is a typical dark nebula, and is famous for resembling the head of a horse.