  We compare the morphology of the core collapse supernova remnant (CCSNR) W49B
with the morphology of many planetary nebulae (PNe), and deduce the orientation
of the jets that shaped this CCSNR and estimate their energy. We find
morphological features that are shared by some PNe and by the CCSNR W49B. In
PNe these features, such as a barrel-shaped main body, are thought to be shaped
by jets. We use these morphological similarities to deduce that the jets that
shaped SNR W49B were launched along the symmetry axis of the `barrel', and to
speculate that this CCSNR has two opposite lobes (or ears), that are too faint
to be observed. We crudely estimate that the jets that shaped the CCSNR into a
barrel shape had a kinetic energy that amounts to about one quarter to one
third of the energy of the entire CCSNR. The morphological similarities
strengthen the suggestion that jets play a central role in the explosion of
massive stars.
