extended filamentary radio nebula

例句：

1. 1. The extended filamentary radio nebula is a fascinatingobject in the night sky.
   扩展的丝状星云是夜空中一个令人着迷的对象。
2. 2. Scientists have been studyingthe extended filamentary radio nebula for decades.
   科学家已经研究这种扩展的丝状星云几十年了。
3. 3. Theextended filamentary radio nebula is believed to be a remnant of a supernova explosion.
   人们认为扩展的丝状星云是超新星爆炸的遗迹。