Cygnus Loop: A double bubble?
  The Cygnus Loop is a well-studied supernova remnant (SNR) that has been
observed across the electromagnetic spectrum. Although widely believed to be an
SNR shell with a blow- out region in the south, we consider the possibility
that this object is two SNRs projected along the same line-of-sight by using
multi-wavelength images and modelling. Our results show that a model of two
objects including some overlap region/interaction between the two objects has
the best match to the observed data.
