Read Edit View history 马蹄星云 mǎtíxīngyún Horseshoe Nebula Origin Definitions Defs Strokes Stroke Words Sentences Sents 马蹄星云 馬蹄星雲 mǎtíxīngyún Horseshoe Nebula the Omega or Horseshoe Nebula, also known as Messier 17