In a paper published in The Astrophysical Journal Letters, researchers studied the Parker's Star Nebula 30 (Pa 30) nebula, the type Iax supernova remnant associated with supernova 1181 (SN 1181).

Figure 1. (a) WISE false color image of Pa 30 where blue and green stand for 11 μm emission, and red for 22 μm. Here, the levels of the 22 μm component have been adjusted to enhance the ring ...