In the only other supernova remnant (the Vela supernova remnant) where such features have been observed, the crescent shapes are clearly produced by ejecta fragments.

• 其他超新星遗迹中，只有一个（船帆座超新星遗迹）观测到了这样的特征，可以确信，该遗迹的新月形外观是抛出的碎片造就的。