nebulas

例句:

• Galactic nebulas are masses of diffuse material within our galaxy.
  银河星云是我们星系中的一团团弥散物.
  
• The investigation of dark nebulas has been facilitated by a new discovery.
  对暗星云的研究被一种新发现所推进.
  
• This suggest that the nebulas are aggregates of stars.
  这说明星云是恒星的聚集体.
  
• The fundamental physical processes occurring within stars, nebulas, and the like would have proceeded unchanged.
  来自SA
• Only four such nebulas are known to exist in globular clusters, the first of which astronomer F.
  来自CNN