X-ray nova

例句：

1. 1.X-ray nova is a type of supernova that occurs in the Milky Way galaxy.
   X射线新星是发生在银河系中的超新星类型。
2. 2. The X-ray nova was discovered by astronomers during a recent observation of the Andromeda galaxy.
   天文学家在最近观察仙女座星系时发现了X射线新星。
3. 3. X-ray nova has been proposed as a possible explanation for the mysterious glowing object in the sky.
   X射线新星被提出作为天空中神秘发光物体的可能解释。